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"The family <em>Nereidae</em> includes some elongated and distinctly annulated worms, which possess a well-developed head, furnished with tentacles and eyes, and a mouth with a proboscis, which is sometimes furnished with two or four teeth." &mdash; Goodrich, 1859

Nereis

"The family Nereidae includes some elongated and distinctly annulated worms, which possess…

"The Grayling is a genus of fresh-water fishes in the salmon family, distinguished from trout, etc., by the smaller mouth and teeth, and by the long, many-rayed dorsal fin. The genus is represented by five species inhabiting clear streams in North America, Europe and Asia."&mdash;(Charles Leonard-Stuart, 1911)

Grayling

"The Grayling is a genus of fresh-water fishes in the salmon family, distinguished from trout, etc.,…

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it and developed from the dermis or true skin. True teeth consist of one, two, or more tissues differing in their chemical composition and in their microscopical appearances. Dentine, which forms the body of the tooth, and 'cement,' which forms its outer crust, are always present, the third tissue, the 'enamel,' when present, being situated between the dentine and cement. The incisors, or cutting teeth, are situated in front. In men there are two of these incisors in each side of each jaw. The permanent incisors, molars, and premolars are preceded by a set of deciduous or milk teeth, which are lost before maturity, and replaced by the permanent ones. The canines come next to the incisors. In man there is one canine tooth in each half-jaw. The premolars (known also as bicuspids and false molars) come next in order to the canines. In man there are two premolars in each half-jaw. The true molars (or multicuspids) are placed most posteriorly. In man there are three molars in each half-jaw, the posterior one being termed the wisdom tooth. The figures [in the illustration] refer to months after birth."&mdash;(Charles Leonard-Stuart, 1911)

First Teeth

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it…

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it and developed from the dermis or true skin. True teeth consist of one, two, or more tissues differing in their chemical composition and in their microscopical appearances. Dentine, which forms the body of the tooth, and 'cement,' which forms its outer crust, are always present, the third tissue, the 'enamel,' when present, being situated between the dentine and cement. The incisors, or cutting teeth, are situated in front. In men there are two of these incisors in each side of each jaw. The permanent incisors, molars, and premolars are preceded by a set of deciduous or milk teeth, which are lost before maturity, and replaced by the permanent ones. The canines come next to the incisors. In man there is one canine tooth in each half-jaw. The premolars (known also as bicuspids and false molars) come next in order to the canines. In man there are two premolars in each half-jaw. The true molars (or multicuspids) are placed most posteriorly. In man there are three molars in each half-jaw, the posterior one being termed the wisdom tooth. The figures [in the illustration] refer to years after birth."&mdash;(Charles Leonard-Stuart, 1911)

Second Teeth

"A Tooth is one of the hard bodies of the mouth, attached to the skeleton, but not forming part of it…

"The Wart Hog closely resembles the true hogs in most of their characters, and particularly in their feet, but is remarkably differing from them in their dentition: The number of teeth is much reduced; the canines become the large tusks, and in the adult the last molar only is found in each jaw, which grows to an enormous size as in the elephant. The head is very large, and the muzzle very broad; the cheeks are furnished with large wart-like excrescences, so that the appearance is altogether very remarkable and uncouth. The species are all natives of Africa. They feed very much on the roots of plants, which they dig up by means of their enormous tusks. The flesh of all the wart hogs and water hogs is in high esteem. They are hunted by dogs, which are often killed in the encounter with them."—(Charles Leonard-Stuart, 1911)

Wart Hog

"The Wart Hog closely resembles the true hogs in most of their characters, and particularly in their…

"Whale is a name that may be taken as equivalent to Cetacean, and applied to any member of that order of mammals, which inculdes two great sets: the toothed whales, such as sperm whale and dolphin, and the whale-bone whales, such as right whale and rorqual, in which the teeth are only embryonic. The order Cetacea is usually divided into three sub-orders: (1) the Mystacoceti or Bal&aelig;noidea, baleen or whalebone whales; (2) the Odontoceti or Delphinoidea, toothed whales; and (3) the Arch&aelig;oceti or extinct Zeuglodonts. The differences between the extant sub-orders are so great that any idea of the close relationship must be abandoned; their common ancestry must be far back, and indeed it is doubtful whether our classification might not be brought nearer the truth by recognizing two distinct orders. Less specialized than the modern types are the extinct Zeuglododonts of the Eocene period, but it is by no means certain that they should be included within the order Cetacea."&mdash;(Charles Leonard-Stuart, 1911)

Whale

"Whale is a name that may be taken as equivalent to Cetacean, and applied to any member of that order…

"There are in all two hundred and six seperate bones in the adult skelton. The teeth are not bones, but are a part of the skin." — Blaisedell, 1904

Human skeleton

"There are in all two hundred and six seperate bones in the adult skelton. The teeth are not bones,…

"A, Palate process of upper jawbone; B, zygoma, forming zygomatic arch; C, condyle, for forming articulation with atlas; D, foramen magnum; E, occipital bone" &mdash; Blaisedell, 1904

Base of skull

"A, Palate process of upper jawbone; B, zygoma, forming zygomatic arch; C, condyle, for forming articulation…

"<em>Temporary Teeth:</em> <em>A</em>, central incisors; <em>B</em>, lateral incisors; <em>C</em>, canines; <em>D</em>, anterior molars; <em>E</em>, posterior molars, <em>F</em>, central incisors; <em>H</em>, lateral incisors; <em>K</em>, canines; <em>L</em>, first bicuspids; <em>M</em>second bicuspids; <em>N</em>, first molars." &mdash; Blaisedell, 1904

Temporary and permanent teeth

"Temporary Teeth: A, central incisors; B, lateral incisors; C, canines;…

"Hyrax is a genus of pachydermatous mammalia, intermediate in their character between the rhinoceros and the tapir. It is characterized by having no canine teeth, but long curved incisors. The front feet have four toes, and the hind feet three. The Cape hyrax is by the colonists of South Africa called rock badger and rock rabbit, from the fact that they inhabit rocky places. They are also called damans."&mdash;(Charles Leonard-Stuart, 1911)

Hyrax

"Hyrax is a genus of pachydermatous mammalia, intermediate in their character between the rhinoceros…

"Lizard is the popular name of numerous reptiles having usually two pairs of limbs and an elongated body terminating in a tail. The lizards number more than a thousand species, accommodating themselves to all conditions except cold, and increasing in size and number in tropical regions. Some lizards are vegetable feeders, but for the most part they are carnivorous and live upon small birds, insects, etc. The eggs are deposited and left to be hatched without care from the parents. The chief families of lizards are the skinks; the geckos; the iguana; and the chameleons. Poison glands are wanting in the lizards; the only exception being the Heloderma of Arizona and Mexico, which is capable of inflicting a poisonous bite by means of poison glands connected with grooved teeth."&mdash;(Charles Leonard-Stuart, 1911)

Lizard

"Lizard is the popular name of numerous reptiles having usually two pairs of limbs and an elongated…

"Dental Branch of One of the Divisions of the Fifth Pair of Cranial Nerves, supplying the Lower Teeth. Branches from the motor root, distributed to various muscles, are also shown." — Blaisedell, 1904

Cranial Nerves

"Dental Branch of One of the Divisions of the Fifth Pair of Cranial Nerves, supplying the Lower Teeth.…

"Dental Branches of One of the Divisions of the Fifth Pair of Cranial Nerves, supply the Upper Teeth." — Blaisedell, 1904

Cranial Nerves

"Dental Branches of One of the Divisions of the Fifth Pair of Cranial Nerves, supply the Upper Teeth."…

"Astarte sulcata; In some systems of zoological classification, a family of dimyarian bi-valves, an external ligament, cardinal teeth, and also lateral teeth on each valve, the pallial line entire, the muscular scars ovate, and a distinct pedal scar above the anterior muscular one."-Whitney, 1902.

Astarte sulcata

"Astarte sulcata; In some systems of zoological classification, a family of dimyarian bi-valves, an…

"The Mandrill is an African baboon. It was well known to the ancients. A full grown male measures about five feet when erect. Mandrills are insectivorous, and in addition to their immense canine teeth approach the Carnivora in many points of anatomical detail."—(Charles Leonard-Stuart, 1911)

Mandrill

"The Mandrill is an African baboon. It was well known to the ancients. A full grown male measures about…

"An Anchor. The anchor used by the ancients was for the most part made of iron, and its form resembled that of the modern anchor. The shape of the two extremities illustrates the unco morsu and dente tenaci of Virgil. Indeed, the Greek and Latin names themselves express the essential property of the anchor being allied to angelus and uncus. The anchor as here represented and as commonly used, was called bidens, because it had two teeth or flukes. Sometimes it had one only, and then it had the epithet." &mdash; Smith, 1873

Ancora

"An Anchor. The anchor used by the ancients was for the most part made of iron, and its form resembled…

An instrument with teeth, for separating, cleansing, and adjusting hair, wool, etc.

Comb

An instrument with teeth, for separating, cleansing, and adjusting hair, wool, etc.

The series of small bones attached to the jaws of animals, or human beings, which serve the purpose of taking and chewing food.

Teeth

The series of small bones attached to the jaws of animals, or human beings, which serve the purpose…

A small bone attached to the jaw for chewing.

Tooth

A small bone attached to the jaw for chewing.

A wheel with cogs or teeth at right angles to its plane.

Crown-wheel

A wheel with cogs or teeth at right angles to its plane.

A bar or piece of mechanism turning at one end upon a pivot, while the other end falls into the teeth of a wheel or rack, allowing the latter to move in one direction only.

Ratchet

A bar or piece of mechanism turning at one end upon a pivot, while the other end falls into the teeth…

A wheel having teeth or cogs, used in ransmitting motion by enguaging the cogs of another similiar wheel or a rack.

Cog Wheel

A wheel having teeth or cogs, used in ransmitting motion by enguaging the cogs of another similiar wheel…

"The <em>Palaeotherium magnum</em> was of the size of a horse, but thicker and more clumsy; its head was massive, and its legs and tail were short. It resembled a large tapir, but differed somewhat as to the teeth, and had one toe less on the fore-feet. Its height was probably from four to five feet; about equal, it is said, to that of the rhinoceros of Java. It was, no doubt, furnished with a short proboscis or trunk." &mdash; Goodrich, 1844

Palaeotherium magnum

"The Palaeotherium magnum was of the size of a horse, but thicker and more clumsy; its head…

A disk of steel with saw teeth upon its periphery, and revolved on an arbor.

Circular-saw

A disk of steel with saw teeth upon its periphery, and revolved on an arbor.

"One half of the permanent set of teeth." &mdash; Ritchie, 1918

Half set of permanent teeth

"One half of the permanent set of teeth." — Ritchie, 1918

"The Savart wheel consists of a heavy metal toothed wheel that may be put in rapid revolution by pulling a cord wound upon its axis. Set such a wheel in rapid motion and hold the edge of a card against its teeth. As the speed of the wheel diminishes, the shrill tone produced by the rapid vibrations of the card correspondingly falls in pitch." &mdash; Avery, 1895

Savart wheel

"The Savart wheel consists of a heavy metal toothed wheel that may be put in rapid revolution by pulling…

"A circular wheel, with teeth on the circumference, by which it can be moved or its motion stayed." &mdash; Williams, 1889

Ratchet-wheel

"A circular wheel, with teeth on the circumference, by which it can be moved or its motion stayed."…

"A wheel having teeth projecting radially from the circumference." &mdash; Williams, 1889

Spur-wheel

"A wheel having teeth projecting radially from the circumference." — Williams, 1889

"The metal cut away near the center reduces the weight and provides passages for air circulation." &mdash; Hawkins, 1917

Solid core disk

"The metal cut away near the center reduces the weight and provides passages for air circulation." —…

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened into dovetail notches in the spider as shown." &mdash; Hawkins, 1917

Armature core

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened…

The mouth and neck laid open. 1: The teeth. 3 and 4: Upper and lower jaws. 5: The tongue. 7: Parotid gland. 8: Sublingual gland. 9: Trachea (wind-pipe). 10 and 11: Esophagus (gullet). 12: Spinal column. 13: Spinal cord.

Mouth and Neck

The mouth and neck laid open. 1: The teeth. 3 and 4: Upper and lower jaws. 5: The tongue. 7: Parotid…

This design is sometimes call by the Persians "sechrudisih," meaning teeth of the rat. Almost distinctive of Caucasian fabrics, especially the Kazaks. Occasionally present in the Turkish and Turkoman rugs also.

Reciprocal Saw-Teeth

This design is sometimes call by the Persians "sechrudisih," meaning teeth of the rat. Almost distinctive…

A genus of fishes found in the freshwater bodies of America and Eurasia. Most species have a long body and flat back, and taper toward the tail with more than ordinary abruptness. Cycloid scales cover the body. The mouth is large, with the lower jaw projecting, and there is a large and powerful array of teeth.

Pike

A genus of fishes found in the freshwater bodies of America and Eurasia. Most species have a long body…

The teeth of a carnivorous animal that lives on flesh alone. The front teeth are tearing ones, while the back teeth have sharp edges for cutting. The flesh is first torn by the front teeth, and then it is cut up by the back ones.

Carnivorous Skeleton

The teeth of a carnivorous animal that lives on flesh alone. The front teeth are tearing ones, while…

A wheel having cogs or teeth set at right angles with its plane. Commonly used in watches.

Crown Wheel

A wheel having cogs or teeth set at right angles with its plane. Commonly used in watches.

An extensive genus of fishes of the ray family, found widely distributed in the ocean, but most abundantly within the tropics. The body is elongated in most species, the tail thick and fleshy, and the teeth are generally large, sharp, and formed for cutting.

Shark

An extensive genus of fishes of the ray family, found widely distributed in the ocean, but most abundantly…

The hard, bony structures situated in the mouth or near the entrance to the pharynx of vertebrates, which are partially exposed when developed and employed for seizing and chewing food.

Teeth

The hard, bony structures situated in the mouth or near the entrance to the pharynx of vertebrates,…

This illustration shows the structure of capsule of Funaria: 5, capsule with calyptra, 5A, removed. 6, section of nearly mature capsule-sp, spore-forming cells surrounded on outside by loosely arranged chlorophyll-bearing cells; o, operculum; r, annulus; p, peristome; a, apophysis. 8, magnified view of a portion of the capsule, showing the annulus, r, and the thick-walled cells of the peristome, p, which are attached at their base to the epidermis by a double row of cells; sp, spore-forming cells, the doted line should run to the four roundish cells at the left. 7, the cells shown in 8, p, have split apart, thus orming the inner and outer teeth-like segments of the peristome.

Funaria

This illustration shows the structure of capsule of Funaria: 5, capsule with calyptra, 5A, removed.…

The blue perch. Up to 12 inches in length and having about 18 dorsal spines, conical teeth in several rows, seperate preoperculum, and scaly cheeks and opercles.

Cunner

The blue perch. Up to 12 inches in length and having about 18 dorsal spines, conical teeth in several…

The teeth are compressed and trunctated, and the lateral line is cimple and arched above the pectoral.

Dab

The teeth are compressed and trunctated, and the lateral line is cimple and arched above the pectoral.

Amphibian Reptiles occur through the age. They are called Labyrinthodonts, because the teeth, like those of the Ganoids, are labyrinthine in the arrangement of the dentine. The earliest traces are tracks found in the Subcarboniferous beds at Pottsville, Pa.; they are about four inches broad.

Sauropus Primaevus

Amphibian Reptiles occur through the age. They are called Labyrinthodonts, because the teeth, like those…

An extinct fossil colossal lizard found in the Wealden strata; so called from the resemblance of its teeth to those of the iguana.

Iguanodon

An extinct fossil colossal lizard found in the Wealden strata; so called from the resemblance of its…

Vampire bat teeth.

Vampire Bat Teeth

Vampire bat teeth.

The mandible is the largest and strongest bone of the face. It serves for the reception of the lower teeth. It consists of a curved, horizontal portion, the body, and two perpendicular portions, the rami, which join the back party of the body nearly at right angles.

Mandible

The mandible is the largest and strongest bone of the face. It serves for the reception of the lower…

They are small size and somber coloration, with the hair on the nape antrorse, the tail naked and scaly at the end, the premolar teeth large, and eye teeth present.

Papuan Kangaroo

They are small size and somber coloration, with the hair on the nape antrorse, the tail naked and scaly…

A monkey looking in to the distance upside down.

Monkey

A monkey looking in to the distance upside down.

"Shell of a Bivalve Mollusk, inner surface. ad.a., depression showing the attachment of the anterior adductor muscle; ad.p., posterior adductor muscle; h, hinge with teeth; l, attachments of the ligaments; p, pallial line, marking the attachment of the mantle muscles; s, the pallial sinus, marking the attachment of the retractor muscles of the siphon; u, umbo or beak." &mdash; Galloway

Bivalve Mollusk

"Shell of a Bivalve Mollusk, inner surface. ad.a., depression showing the attachment of the anterior…

A fish with elongated form, subconical head, and sharp canines mixed with the villiform teeth from the jaws and palate.

Pike Perch

A fish with elongated form, subconical head, and sharp canines mixed with the villiform teeth from the…

A pinion and spur gear meshed together.

Gears

A pinion and spur gear meshed together.

The skull of a crocodile with visible teeth.

Crocodile Skull

The skull of a crocodile with visible teeth.

The skull of a serpent with visible teeth.

Serpent Skull

The skull of a serpent with visible teeth.

The side view and base of the skull of an ape.

Ape Skull

The side view and base of the skull of an ape.

A dolphin with about 120 teeth, 50 vertebrae, extremely narrow jaw, no pelvic bone, rudimentary eyes, and obsolete dorsal fin.

Gangetic Dolphin

A dolphin with about 120 teeth, 50 vertebrae, extremely narrow jaw, no pelvic bone, rudimentary eyes,…

The bottom jaw of an iguana.

Iguana Jaw

The bottom jaw of an iguana.

A bird that picks out decaying meat from crocodile's teeth.

Crocodile Bird

A bird that picks out decaying meat from crocodile's teeth.

"Waldheimia flavescens. Interior of ventral valve. f, foramen; d, deltidium; t, teeth; a, adductor impressions; c, divaricator; d, accessory divaricators; b, ventral adjustor; b', peduncular muscle." &mdash; Encyclopedia Britanica, 1893

Ventral Valve

"Waldheimia flavescens. Interior of ventral valve. f, foramen; d, deltidium; t, teeth; a, adductor impressions;…

"The click barrel-ratchet R is set upon another larger ratchet-wheel, with its teeth pointing the opposite way, and its click rT is set in the clock-frame. That ratchet is connected with the great wheel by a spring ss' pressing against the two pins s in the ratchet and s' in the wheel. When you wind up the weight, the click Tr prevents the ratchet from turning back or to the right; and as the spring ss' is kept by the weight in a state of tension equivalent to the weight itself it will drive the wheel to the left for a short distance, when its end s is held fast, with the same force as if that end was pulled forward by the weight; and as the great wheel has to move very little during the short time the clock is winding, the spring will keep the clock going long enough." &mdash; Encyclopedia Britanica, 1893

Harrison's Going-Ratchet

"The click barrel-ratchet R is set upon another larger ratchet-wheel, with its teeth pointing the opposite…

"E represents the scape-wheel turning in a minute, and e its pinion, which is driven by the wheel D having a pinion d driven by the wheel C, which we may suppose to turn in an hour. The arbors of the scape-wheel and hour-wheel are distinct, their pivots-meeting in a bush fixed somewhere between the wheels. The pivots of the wheel, D are set in the frame AP, which rides on the arbors of the hour-wheel and scape-wheel, or on another short arbor between them. The hour-wheel also drives another wheel G, which again drives the pinion f on the arbor which carries the two arms f A, f B; and on the same arbor is set a fly with a ratchet, like a common striking fly, and the numbers of the teeth are so arranged that the fly will turn once for each turn of the scapewheel. The ends of the remontoire arms f A, f B are capable of alternately passing the notches cut half through the arbor of the scape-wheel, as those notches successively come into the proper position at the end of every half minute; as soon as that happens the-hour-wheel raises the movable wheel D and its frame through a small angle; but nevertheless, that wheel keeps pressing on the scape-wheel as if it were not moving, the point of contact of the wheel C and the pinion d being the fulcrum or center of motion of the level A d P." &mdash; Encyclopedia Britanica, 1893

Gravity Train Remontoire

"E represents the scape-wheel turning in a minute, and e its pinion, which is driven by the wheel D…

A wheel with pointed and anglar teeth, against which a ratchet abuts, used either for converting a reciprocating into a rotary motion or for admitting motion in one direction only.

Ratchet Wheel

A wheel with pointed and anglar teeth, against which a ratchet abuts, used either for converting a reciprocating…

"Side view of skull of horse, with the bone removed so as to expose the whole of the teeth. PMx, premaxilla; Mx, maxilla; Na, nasal bone; Ma, malar bone; L, lacrymal bone; Fr, frontal bone; Sq, squamosal bone; Pa, parietal bone; oc, occipital condyle; pp, paroccipital process; i, the three incisor teeth; c, the canine tooth; pm1, the situation of the rudimentary first premolar, which has been lost in the lower, but is present in the upper jaw; pm2, pm3, and pm4, the three fully-developed premolar teeth; m, the three true molar teeth." &mdash; Encyclopedia Britannica, 1893

Horse Skull

"Side view of skull of horse, with the bone removed so as to expose the whole of the teeth. PMx, premaxilla;…