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Diagrammatic horizontal section of a vertebrate brain. Mb, midbrain: what lies in front of this is the fore-, and what lies behind, the hindbrain; Lt, lamina terminalis; Olf, olfactory lobes; Hmp, hemispheres; Th. E, thalamencephalon; Pn, pineal gland; Py, pituitary body; F. M., foramen of Munro; cs, corpus striatum; Th, optic thalamus; CC, crura cerebri; the mass lying above the canal represents the corpora quadrigemina; Cb, cerebellum; I-IX, the nine pairs of cranial nerves; 1, olfactory ventricle; 2, lateral ventricle; 3, third ventricle; 4, fourth ventricle; +, iter a tertio ad quartum ventriculum.

Horizontal Section of a Vertebrate Brain

Diagrammatic horizontal section of a vertebrate brain. Mb, midbrain: what lies in front of this is the…

Internal ear of different vertebrates. I, fish; II, bird; III, mammal. Labels: U, utriculus with semicircular canals; S, sacculus; US, utriculus and sacculus; C, cochlear duct; L, lagena; Cr, canalis reuniens; R, recessus vestibuli.

Internal Ear of Vertebrates

Internal ear of different vertebrates. I, fish; II, bird; III, mammal. Labels: U, utriculus with semicircular…

The Jumping Mouse (Zapus hudsonius) is a N. American, jerboa-like mouse, with long hind legs, a very long tail, and five complete toes on the hind foot. It is warmly reddish above, white on the lower parts, and progresses, when alarmed, by a series of rapid leaps, each of several yards, when in haste. it dwells in open, grassy places, skulking about under the herbage and feeding mostly on grass seeds; there it places its nest (a hollow ball of grass) in some small hole or burrow, and spends the cold months in a long hibernation.

Jumping Mouse

The Jumping Mouse (Zapus hudsonius) is a N. American, jerboa-like mouse, with long hind legs, a very…

Diagrams illustrating the development of the urinogenital organs of a vertebrate. A, pronephros and segmental duct; B, atrophy of pronephros, development of mesonephros; C, appearance of Mullerian duct; D, development of metanephros, male type; E, the same, female type. The sex gland, ovary and testis is obliquely shaded; phonephros and mesonephros unshaded, metanephros stippled; Mullerian duct heavily shaded. The large chamber to the right, into which these ducts as well as the intestine open, is the cloaca.

Urinogenital Organs of a Vertebrate

Diagrams illustrating the development of the urinogenital organs of a vertebrate. A, pronephros and…

A, Diagrammatic transverse section through the body of a vertebrate. B, A similar section through a highly organized invertebrate animal. Labels: a, neural canal; b, cerebrospinal nerve center; c, notochord; d, sympathetic nerve center; e, alimentary canal; f, visceral canal wall; g, haemal system.

Vertebrate and Invertebrate

A, Diagrammatic transverse section through the body of a vertebrate. B, A similar section through a…

"Diagrams illustrating two stages in the development of the vertebrate eye. A, showing the relation of the ectoderm, the brain vesicle, and the optic vesicle. The right side of the figure shows a later stage than the left. B, later stage, showing the lens, eye-ball and retina in position. b.v., brain vesicle formed by the invagination oof the ectoderm (ect.); l, lens; mes., mesodermal tissue; o.n., optic nerve; o.s., optic stalk; o.v., optic vesicle, a portion of the brain vesicle; r, retinal layer; v.h., interior of eye-ball which comes to contain the vitreous humor." — Galloway

Vertebrate Eye

"Diagrams illustrating two stages in the development of the vertebrate eye. A, showing the relation…

Diagrammatic sections of the ideal vertebrate. A, sagittal section showing the brain and spinal cord on the dorsal side of the notochord, and the alimentary canal and viscera on the ventral side of it. B, transverse section of the head, showing a gill arch and filaments of the left and a gill cleft on the right. C, transverse section of the trunk, showing the gut, the genital glands, and the excretory organs in the body cavity. D, transverse section of the tail.

Section of Vertebrate

Diagrammatic sections of the ideal vertebrate. A, sagittal section showing the brain and spinal cord…

A diagram of a transverse section of a vertebrate. Labels: 1, the walls; 2, digestive organs; 3, circulatory organs; 4, ganglia; 5, spinal cord; 6, spinal column.

Transverse Section of a Vertebrate

A diagram of a transverse section of a vertebrate. Labels: 1, the walls; 2, digestive organs; 3, circulatory…

"Fore limbs of vertebrates showing similarity of structure. <em>A</em>, salamander; <em>B</em>, turtle; <em>C</em>, very young bird; <em>D</em>, adult bird; <em>E</em>, dog; <em>F</em>, man." &mdash; Davison, 1906

Forearms of vertebrates

"Fore limbs of vertebrates showing similarity of structure. A, salamander; B, turtle;…