The lower jaw and teeth of the Megatherium, elephant sized sloth. The teeth are quandrangular, or triangular cylinder, shaped and grew during their life time.

Lower Jaw of Megatherium Fossil Skeleton

The lower jaw and teeth of the Megatherium, elephant sized sloth. The teeth are quandrangular, or triangular…

A full fossil skeleton of the Megatherium, an elephant sized ground sloth. The animal was extinct during the Pleistocene, and found in Buenos Aires. The shape of the skull suggests that the animal is an ancestor of the sloth and anteater.

Full Megatherium Fossil Skeleton

A full fossil skeleton of the Megatherium, an elephant sized ground sloth. The animal was extinct during…

"In the other forms the number (vertebrae) varies between twenty and thirty three, the latter being spider monkeys. The proportion in the spider monkeys of the genus Ateles, almost three to one; in the other longest—tailed genera it is rarely so large as two to one." —Encyclopaedia Britannica, 1910

Side View of Skeleton of South American Spider Monkey

"In the other forms the number (vertebrae) varies between twenty and thirty three, the latter being…

The human skeleton.

The Human Skeleton

The human skeleton.

"Fig 55. - Actual section of the body in the thoracic region of a bird. N, neural canal; H, haemal canal; c, centrum of a dorsal vertebra; hy, hypapophysis; d, diapophysis; z, zygapophysis; ns, neural spine; r, pleurapophysis, or vertebral part of a free rib, bearing u, uncinate process or epipleura; cr, haemapophyses; or sternal part of the same; st, section of the sternum or breast-bone (haemal spine). Designed by Dr. R. W. Shufeldt, USA. This figure shows such a section, made across the thoracic or chest-region of the trunk. Here the upper ring (neural) is contracted, only surrounding the slender spinal cord, while the lower ring is expanded to enclose the heart and lungs." Elliot Coues, 1884

The Axial Skeleton

"Fig 55. - Actual section of the body in the thoracic region of a bird. N, neural canal; H, haemal canal;…

The human skeleton.

The Human Skeleton

The human skeleton.

Skeleton of a tortoise, seen from below, the plastron having been removed. (ca) carapace.

Tortoise Skeleton

Skeleton of a tortoise, seen from below, the plastron having been removed. (ca) carapace.

Illustration showing the upper molar teeth of the megatherium, a giant sloth. The teeth were 7 to 8 inches inside the gums.

Upper Molar Teeth of Megatherium Fossil Skeleton

Illustration showing the upper molar teeth of the megatherium, a giant sloth. The teeth were 7 to 8…

A side-view of the skull.

Skull

A side-view of the skull.

A front-view of the skull.

Skull

A front-view of the skull.

The skull at birth, superior suerface. The cranial bones of the infant at birth are not fullyformed and their edges are separated by membranous intervals. Labels: 1, posterior fontanelle; 2, sagital suture; 4, anterior fontanelle; A, A, bi-parietal diameter; B, B, bi-temporal diamter.

Human Skull at Birth

The skull at birth, superior suerface. The cranial bones of the infant at birth are not fullyformed…

"Schizognathous skull of common fowl. pmx, premaxilla; mxp, maxillopalatine; mx, maxilla; pl, palatine; pt, pterygoid; vo, vomer." -Whitney, 1911

Bird Skull

"Schizognathous skull of common fowl. pmx, premaxilla; mxp, maxillopalatine; mx, maxilla; pl, palatine;…

A side view of the howler monkey skull. The monkey have four sharp canines, long teeth on skull, on top and bottom of the jaw.

Side View of Howler Monkey

A side view of the howler monkey skull. The monkey have four sharp canines, long teeth on skull, on…

The skull. Labels: a, nasal bone; b, superior maxillary; c, inferior maxillary; d, occipital; e, temporal; f, parietal; g, frontal bone.

Human Skull

The skull. Labels: a, nasal bone; b, superior maxillary; c, inferior maxillary; d, occipital; e, temporal;…

An illustration of an adult male orangutan viewed from the side. The orbit part of the skull is more rounded than humans. The cranium, top part of the skull, and the mouth area are elongated compared to humans.

Adult Male Orangutan Skull Viewed from Side

An illustration of an adult male orangutan viewed from the side. The orbit part of the skull is more…

Sphenoid bone, situated the anterior part of the base of the skull, articulating with all the other cranial bones, which it binds firmly and solidly together. Labels: a, greater wing; b, lesser wing.

Sphenoid Bone of the Human Skull

Sphenoid bone, situated the anterior part of the base of the skull, articulating with all the other…

Side view of spinal column, without sacrum and coccyx. Labels: 1 to 7, cervical vertebrae; 8 to 19, dorsal vertebrae; 20 to 24, lumbar vertebrae; A, A, spinous processes; C, D, transverse processes; E, intervertebral aperture or foramen; a, atlas; 2, axis.

Human Spinal Column

Side view of spinal column, without sacrum and coccyx. Labels: 1 to 7, cervical vertebrae; 8 to 19,…

<p>The Skeleton asked his friends, "Do you think this is a gathering, a shindig, or a hootenanny?"</p>

<p>The Ghost said, "I don't know, what's difference?"</p>

<p>The Zombie asked, "Arruugh?"</p>

<p>"Well," said said the Skeleton, "a gathering is cheese, and mellow song stylings. A shindig is some dip, less mellow song stylings, perhaps a large amount of punch. And, well, hootenanny is chock full of hoot just a little bit of nanny".</p>

<p>Since they had no cheese, music, or punch but had a fair bit of hoot <em>and</em> nanny (particularly so in the Zombie's case) they all agreed that it was indeed a Hootenanny they found themselves attending.</p>

<p>Illustrated by James Basom Seaman II</p>

Spooky Hootenanny

The Skeleton asked his friends, "Do you think this is a gathering, a shindig, or a hootenanny?" The…

Sternum, front and side view. The sternum, or breast bone, is a flat narrow bone, situated in the median line in the front of the chest, and consisting, in the adult, of 3 portions.

Human Sternum Bone

Sternum, front and side view. The sternum, or breast bone, is a flat narrow bone, situated in the median…

An illustration of the front left tarsus of a penguin. "a, articular facet for inner condyle of tibia; b, articular facet for outer condyle; c, c, two foramina, showing incomplete fusion of three metatarsals; d, point of attachment of accessory metatarsal; 2, 3, 4, articular facets for second, third, and fourth toes." -Century, 1889

Front Left Tarsus of a Penguin

An illustration of the front left tarsus of a penguin. "a, articular facet for inner condyle of tibia;…

Temporal bone of the human skull. The temporal bones are situated at the sides and base of the skull. Labels: 1, squamous portion; 2, placed below external opening of auditory canal in petrous portion; 3, placed below mastoid portion; 4, placed below glenoid cavity for reception of condyle of lower jaw.

Temporal Bone of the Human Skull

Temporal bone of the human skull. The temporal bones are situated at the sides and base of the skull.…

Thorax. The thorax, or chest, is an elongated conical-shaped cage, formed by the sternum and costal cartilages in front, the 12 ribs on each side, and the bodies of the 12 dorsal vertebrae behind. It contains and protects the principal organs of respiration and circulation. Labels: 1 to 12, ribs; d, d, costal cartilages; e, upper end of sternum; b, middle portion of sternum; 1 a, first dorsal vertebra; 12 a, twelfth dorsal vertebra; 7 a, seventh cervical vertebra; 1 to 7, true ribs; 8 to 12, false ribs; 11, 12, floating ribs. 10th rib is defective; it should be attached to the costal cartilage.

Human Thorax (Chest)

Thorax. The thorax, or chest, is an elongated conical-shaped cage, formed by the sternum and costal…

"A Skeleton of a young colony of <em>Tubipora purpurea</em>. st, stolon; p, platform. B, Diagrammatic longitudinal section of a corallite, showing two platforms, p, and simple and cup-shaped tabulae, t." &mdash;Encyclopedia Britannica, 1910

Colony of Tubipora Purpurea

"A Skeleton of a young colony of Tubipora purpurea. st, stolon; p, platform. B, Diagrammatic…

"Turtle is, in zoology, the popular name for any species of the Cheloniid&aelig;. They may be distinguished by their long, compressed, fin-shaped, non-retractile feet, with the toes inclosed in a common skin, from which only one or two claws project. The carapace is broad and much depressed, so that when these animals are on shore, and are turned over on their backs, they cannot regain the natural position. Turtles are marine animals; their pinnate feet and light shell render them excellent swimmers. They sometimes live at a great distance from land, to which they periodically return to deposit their soft-shelled eggs in the sand."&mdash;(Charles Leonard-Stuart, 1911)

Skeleton of Turtle

"Turtle is, in zoology, the popular name for any species of the Cheloniidæ. They may be distinguished…

Skeleton of a turtle.

Skeleton of a turtle

Skeleton of a turtle.

The ulna bone in the human arm.

Ulna

The ulna bone in the human arm.

"The <em>ulna</em>, or elbow bone, is the larger of these two bones. It is joined to the humerus by a hinge joint at the elbow. It is on the same side as the little finger. The <em>radius</em>, queerly named because it is supposed to resemble one of the spokes of a wheel, is the long, slightly curved, outer bone fo the forearm. It is on the same side as the thumb. Its upper end is fastened both to the ulna and the humerus." — Blaisedell, 1904

Ulna and Radius

"The ulna, or elbow bone, is the larger of these two bones. It is joined to the humerus by…

The Ulna and Radius. Labels: 1, radius; 2, ulna; o, olecranon process, on the anterior surface of which are seen the large (gs) and the small (ls) cavities for the reception of the lower end of the humerus and of the head of the radius, respectively; h, head of radius.

The Human Ulna and Radius

The Ulna and Radius. Labels: 1, radius; 2, ulna; o, olecranon process, on the anterior surface of which…

A section of a human vertebra, showing structure.

Section of Vertebra

A section of a human vertebra, showing structure.

"Section of two lumbar vertebrae, showing ligaments."&mdash;Finley, 1917

Lumbar vertebrae

"Section of two lumbar vertebrae, showing ligaments."—Finley, 1917

Vomer bone, a single bone placed at the back part of the nasal cavity, and forms part of the septum of the nasal fossae.

Human Vomer Nasal Bone

Vomer bone, a single bone placed at the back part of the nasal cavity, and forms part of the septum…

"Skeleton of Egyptian Vulture. (Neophron percnopterus), to show bones of bird. a, post-orbital process; b, lower jaw; c, cervical vertebra; co, coracoid bone; d, humerus; e, radius; f, ulna; g, metacarpus; h, second phalanx of chief digit of wing; h, phalanges of lower digit; h'', first phalanx of chief digit; i, clavicle; k, sternum; l, pelvis; m, coccyx; n, femur; o, tibia; p, tarso-metatarsus; q, phalanges of foot." &mdash; Winston's Encyclopedia, 1919

Vulture Skeleton

"Skeleton of Egyptian Vulture. (Neophron percnopterus), to show bones of bird. a, post-orbital process;…

An illustration of a whale skeleton.

Whale Skeleton

An illustration of a whale skeleton.

Bones of the Wrist and Hand. Labels: m, metacarpal bones; p, phalanges; 3, bones of wrist.

The Human Wrist and Hand Bones

Bones of the Wrist and Hand. Labels: m, metacarpal bones; p, phalanges; 3, bones of wrist.

An illustration of Xiphacantha showing the siliceous skeleton.

Xiphacantha

An illustration of Xiphacantha showing the siliceous skeleton.