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The Hesperornis regalis was an ancient bird of the Cretaceous Period.

Hesperornis Regalis

The Hesperornis regalis was an ancient bird of the Cretaceous Period.

The coat of arms of Chile.

Chilean Coat of Arms

The coat of arms of Chile.

The Coat of Arms of Venezuela.

Venezuelan Coat of Arms

The Coat of Arms of Venezuela.

A horse-chestnut leaf.

Horse-Chestnut Leaf

A horse-chestnut leaf.

A child riding a stick horse.

Stick Horse

A child riding a stick horse.

A boy holding the reigns of a large horse.

Boy and Horse

A boy holding the reigns of a large horse.

A lady riding a horse.

Lady on Horse

A lady riding a horse.

A cavalcade riding after a lady on a horse.

Cavalcade

A cavalcade riding after a lady on a horse.

A boy and girl riding in a horse-drawn carriage.

Horse and Carriage

A boy and girl riding in a horse-drawn carriage.

The skeleton of a frog.

Frog Skeleton

The skeleton of a frog.

"Skull of Boa constrictor. a, quadrate bone; b, b, halves of lower jaw." -Cooper, 1887

Boa Constrictor Skull

"Skull of Boa constrictor. a, quadrate bone; b, b, halves of lower jaw." -Cooper, 1887

The leaves of the skeleton-leaved geranium, Pelargonium radula.

Skeleton-Leaved Germanium

The leaves of the skeleton-leaved geranium, Pelargonium radula.

A police officer riding a horse.

Police Officer

A police officer riding a horse.

"Restored skeleton of Palaeospondylus gunni. d.c., Cirri of dorsal margin; l.c., long lateral cirri; v.c., cirri of ventral margin; n., nasal ring; t.p., anterior trabeculo-palatine part of cranium; b., anterior depression or fenestra; c., posterior depression or fenestra; a., lobe divided off from anterior part; p.a., posterior or parachordal part of cranium; x., post-occipital plates." -Thomson, 1916

Palaeospondylus Gunni

"Restored skeleton of Palaeospondylus gunni. d.c., Cirri of dorsal margin; l.c., long lateral cirri;…

Skeleton of skate. nc, nasal capsules; pq, palato-pterygo-quadrate cartilage; M, Meckel's cartilage; hm, hyo-mandibular; h.br., fifth hypobranchial; v.pl., vertebral plate; st, sensory tubes; sc, scapular region; c, coracoid region; p.pt., anterior basal cartilage or pro-pterygium; m.pt., meso pterygium; mt.pt., meta-pterygium; pu., pubic bar; st, stomach; sv, spiral valve of intestine. -Thomson, 1916

Skate Skeleton

Skeleton of skate. nc, nasal capsules; pq, palato-pterygo-quadrate cartilage; M, Meckel's cartilage;…

"Pectoral girdle and fin of cod. fr., Fin-rays; b.o., brachial ossicles; cor., coracoid; sc., scapula; cl., clavicle; p.cl., post-clavicle; s.cl., supra-clavicle; p.t., post-temporal." -Thomson, 1916

Cod Fin

"Pectoral girdle and fin of cod. fr., Fin-rays; b.o., brachial ossicles; cor., coracoid; sc., scapula;…

"Skeleton of Ceratodus fin. a., Central axis; r., radials; h., basal piece." -Thomson, 1916

Queensland Lungfish Fin

"Skeleton of Ceratodus fin. a., Central axis; r., radials; h., basal piece." -Thomson, 1916

"Vertebral column and pelvic girdle of bull-frog. t.p., Transvers processes of sacral vertebra; Il., ilium; U., urostyle; Fe., femur; Isch., ischiac region." -Thomson, 1916

Bullfrog Vertebrae

"Vertebral column and pelvic girdle of bull-frog. t.p., Transvers processes of sacral vertebra; Il.,…

"Skeleton of frog. The half of the pectoral girdle, and fore- and hind-limb of the right side are not shown. pmx., premaxilla; m.x., maxilla; n., nasal; sph., sphenethmoid; p.f., parieto-frontal; P.O., pro-otic; pt., pterygoid; q.j., quadrato-jugal; sq., squamosal; Q., quadrate; c., columella auris; A., atlas; t.p., transverse process; S.V., sacral vertebra; U., urostyle; S.sc., supra scapula; H., humerus; R.U., radio ulna; Cp., carpals; Mc., metacarpals; Il., ilium; Is., ischium; F., femur; T.F., tibio-fibula; Ca., calcaneum; As., astragalus; C., calcar; Mt., metatarsals." -Thomson, 1916

Frog Skeleton

"Skeleton of frog. The half of the pectoral girdle, and fore- and hind-limb of the right side are not…

"Internal view of tortoise skeleton. H., humerus; SC., scapula running dorsally; PC., precoracoid; C., coracoid; EC., epicoracoid cartilage; P., pubis; IL., ilium running dorsally to sacral vertebrae; IS., ischium; DV., dorsal vertebrae fused in carapace; R., head of a rib; CEV., cervical vertebrae free; CAV., caudal vertebrae free." -Thomson, 1916

Tortoise Skeleton

"Internal view of tortoise skeleton. H., humerus; SC., scapula running dorsally; PC., precoracoid; C.,…

"Entire skeleton of condor, showing the relative positions of the chief bones." -Thomson, 1916

Condor Skeleton

"Entire skeleton of condor, showing the relative positions of the chief bones." -Thomson, 1916

"Hesperornis. ST., Sternum; CO., coracoid; CL., clavicle; H., rudimentary humerus; SC., scapula; P., pectineal pubic process; IL., ilim; IS., ischium; P.P., post-pubis; C.T., crest of tibia; F. fibula; T.T., base tibio-tarsus; T.M.T., tarso-metatarsus." -Thomson, 1916

Hesperornis Skeleton

"Hesperornis. ST., Sternum; CO., coracoid; CL., clavicle; H., rudimentary humerus; SC., scapula; P.,…

"Side view of horse's skull. P., Parietal; FR., frontal; NA., nasal; PMX., premaxilla; MX., maxilla; J., jugal; L., lachrymal; SQ., squamosal; PP., paroccipital process; CO., condyle CA., canine." -Thomson, 1916

Horse Skull

"Side view of horse's skull. P., Parietal; FR., frontal; NA., nasal; PMX., premaxilla; MX., maxilla;…

"Feet of horse and its predecessors. 1, Palaeotherium; 2, Anchitherium; 3, Hippotherium; 4, Equus." -Thomson, 1916

Horse Feet

"Feet of horse and its predecessors. 1, Palaeotherium; 2, Anchitherium; 3, Hippotherium; 4, Equus."…

"Skeleton of male gorilla. cl., Clavicle; sc., tip of scapula; S., praesternum; H., humerus; r., radius; u., ulna; Il., ilium; C., coccyx; P., pubis; Is., ischium; F., femur; t., tibia; f., fibula." -Thomson, 1916

Gorilla Skeleton

"Skeleton of male gorilla. cl., Clavicle; sc., tip of scapula; S., praesternum; H., humerus; r., radius;…

"Actinomma, a radiolarian with a shell and no mouth. A, whole animal with a portion of two spheres of shell removed. B, section, showing relation of protoplasm to the skeleton. c., central capsule; n, nucleus; p, protoplasm; o, openings through which the pseudopodia extend." -Galloway, 1915

Actinomma

"Actinomma, a radiolarian with a shell and no mouth. A, whole animal with a portion of two spheres of…

A Native American father and his son find a pony while hiking near the mountains.

Native Americans with Pony

A Native American father and his son find a pony while hiking near the mountains.

A man riding a horse, lassoing a book of arithmetic.

Man Lassoing Book

A man riding a horse, lassoing a book of arithmetic.

"Liteocircus annularis. cent. caps, central capsule; ext. caps. pr, extra-capsular protoplasm; int. cap. pr, intra-capsular protoplasm; nu, nucleus; psd, pseudopods; skel, skeleton; z, cells of zooxanthella." -Parker, 1900

L. Annularis

"Liteocircus annularis. cent. caps, central capsule; ext. caps. pr, extra-capsular protoplasm; int.…

"Salmo fario, the entire skull, from the left side. art, articular; branchiost, branchiostegal rays; dent, dentary; epiot, epiotic; eth, supra-ethnoid; fr, frontal; hyom, hyomandibular; intop, inter-opercular; pal, palantine; par, parietal; pmx, pre-maxilla; praop, pre-opercular; pt, pterygoid; pter, pterotic; Quad, quadrate; socc, supra-occipital; sphot, sphenotic; subop, sub-opercular; sympl, symplectic; Zunge, basi-hyal." -Parker, 1900

Fish Skull

"Salmo fario, the entire skull, from the left side. art, articular; branchiost, branchiostegal rays;…

"Skeleton of crocodile. C, causal region; D, thoracic region of spinal column; F, fibula; Fe, femur; H, humerus; I, ischium; L, lumbar region; R, radius; Ri, ribs; S, sacrum; Sc, scapula; Sta, abdominal ribs; T, tibia; U, ulna." -Parker, 1900

Crocodile Skeleton

"Skeleton of crocodile. C, causal region; D, thoracic region of spinal column; F, fibula; Fe, femur;…

"Cistudo lutaria. Skeleton seen from below; the plastron has been removed and is represented on one side. C, costal plate; Co, coracoid; e, entoplastron; Ep, epiplastron; F, fibula; Fe, femur; H, humerus; Il, ilium; Is, ischium; M, marginal plates; Nu, nuchal plate; Pb, pubis; Pro, pro-coracoid; Py, pygal plates; R, radius; Sc, scapula; T, tibia; U, ulna." -Parker, 1900

Marsh Turtle Skeleton

"Cistudo lutaria. Skeleton seen from below; the plastron has been removed and is represented on one…

"Chelone midas. Transverse section of skeleton. C, costal plate; C', centrum; M, marginal plate; P, lateral element of plastron; R, rib; V, expanded neural plate." -Parker, 1900

Green Turtle Skeleton

"Chelone midas. Transverse section of skeleton. C, costal plate; C', centrum; M, marginal plate; P,…

Of the Mint family (Labiatae), the rich weed (Collinsonia Canadensis).

Rich Weed

Of the Mint family (Labiatae), the rich weed (Collinsonia Canadensis).

Of the Mint family (Labiatae), the horse mint (Mentha longifolia).

Horse Mint

Of the Mint family (Labiatae), the horse mint (Mentha longifolia).

Of the Honeysuckle family (Caprifoliaceae), the feverwort (Triosteum perfoliatum).

Feverwort

Of the Honeysuckle family (Caprifoliaceae), the feverwort (Triosteum perfoliatum).

"Nearly perfect fossil skeleton of Archaegosaurus." -Taylor, 1904

Archegosaurus

"Nearly perfect fossil skeleton of Archaegosaurus." -Taylor, 1904

The skeleton of Ichthyosaurus.

Ichthyosaurus

The skeleton of Ichthyosaurus.

The skeleton of Plesiosaurus.

Plesiosaurus

The skeleton of Plesiosaurus.

The wing skeleton of the pterodactyle.

Pterodactyle Wing

The wing skeleton of the pterodactyle.

The skeleton of a bat's wing.

Bat Wing

The skeleton of a bat's wing.

Palaeotherium magnum, an extinct tapir-like mammal.

Palaeotherium magnum

Palaeotherium magnum, an extinct tapir-like mammal.

Anoplotherium, an extinct hoofed mammal.

Anoplotherium

Anoplotherium, an extinct hoofed mammal.

"Skeleton of Mastodon giganteum." -Taylor, 1904

Mastodon giganteum

"Skeleton of Mastodon giganteum." -Taylor, 1904

"Skeleton of the Mylodon, a fossil American Sloth of Pliocene age." -Taylor, 1904

Mylodon

"Skeleton of the Mylodon, a fossil American Sloth of Pliocene age." -Taylor, 1904

"The mammoth (Elephas primigenius)." -Taylor, 1904

Mammoth

"The mammoth (Elephas primigenius)." -Taylor, 1904

"Irish elk (Cervus megaceros)." -Taylor, 1904

Irish Elk

"Irish elk (Cervus megaceros)." -Taylor, 1904

The skeleton.

The Skeleton

The skeleton.

A primitive giraffe-camel. This primitive camel has no humps and an elongated neck, resembling a giraffe.

primitive giraffe-camel

A primitive giraffe-camel. This primitive camel has no humps and an elongated neck, resembling a giraffe.

A primitive desert horse during the time period of Miocene.

Desert Horse

A primitive desert horse during the time period of Miocene.

"Dissected bud of buckeye (Aesculus macrostachya), showing transitions from bud-scales to leaves." -Bergen, 1896

Buckeye Bud

"Dissected bud of buckeye (Aesculus macrostachya), showing transitions from bud-scales to leaves." -Bergen,…

From an archaic Greek vase, a picture of horses and chariots.

Aryan Speaking People, Horses and Chariots

From an archaic Greek vase, a picture of horses and chariots.

A freshwater hydra, magnified. Example of an animal with no skeleton. There are animals without a skeleton that are not able to accomplish very powerful motions. Mot of them live in water where they are partly or wholly held up by the water and have only slow motions. Most are also very small and generally have no muscles.

Freshwater Hydra

A freshwater hydra, magnified. Example of an animal with no skeleton. There are animals without a skeleton…

"The fall of the horse-chestnut leaf." -Bergen, 1896

Buckeye Leaves

"The fall of the horse-chestnut leaf." -Bergen, 1896

Plan of the body in cross-section. The systems in the body are arranged in a certain way which is the same in all animals which have a backbone. The plan of the bony skeleton is a central axis from which all other parts are extended. In this lies the central axis of the nervous system, from which its branches also extend.

Diagram of the Body Plan

Plan of the body in cross-section. The systems in the body are arranged in a certain way which is the…

"Leaf arrangement of horse-chestnut on vertical shoots." -Bergen, 1896

Buckeye Leaves

"Leaf arrangement of horse-chestnut on vertical shoots." -Bergen, 1896

"Leaf arrangement of horse-chestnut on vertical shoots." -Bergen, 1896

Buckeye Leaves

"Leaf arrangement of horse-chestnut on vertical shoots." -Bergen, 1896

"Bees visiting flowers. At the left, a bumblebee on the flower of the dead nettle; below, a similar bee in the flower of the horse-chestnut; above, a honey-bee in the flower of a violet." -Bergen, 1896

Bees Visiting Flowers

"Bees visiting flowers. At the left, a bumblebee on the flower of the dead nettle; below, a similar…

Wolves attacking a traveler. Caption below illustration: "The road now ran along the skirts of a pine forest, when the traveler suddenly perceived a suspicious noise behind her. Casting back a look of alarm, she saw a troop of wolves trotting along the road, the number of which her fears hindered her from estimating."

Wolves Attacking a Traveler

Wolves attacking a traveler. Caption below illustration: "The road now ran along the skirts of a pine…

"A scouring-rush (Equisetum sylvaticum). At the right is a colorless fertile stem, in the middle a green sterile one, and at the left a green fertile one." -Bergen, 1896

Scouring Rush

"A scouring-rush (Equisetum sylvaticum). At the right is a colorless fertile stem, in the middle a green…