. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. SZ MORPHOLOGY OF THE ORGANS OF rERTEBRATES. We are now in position to describe the eye of the adult ver- tebrate. The eye proper is approximately spherical, although, as in fishes, it may be flattened, or, as in birds, somewhat coni- cal in front. In the ichthyopsida it is w-ithout any well-devel- oped external accessories for protection ; ^ but in the amniotes. a n sh Fig. SS. Horizontal section through human eye, from Hertwig after Arlt. i-', arteria centralis: a:, anterior chamber of eye; t, cornea; ch, choroid: cj, conju
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. SZ MORPHOLOGY OF THE ORGANS OF rERTEBRATES. We are now in position to describe the eye of the adult ver- tebrate. The eye proper is approximately spherical, although, as in fishes, it may be flattened, or, as in birds, somewhat coni- cal in front. In the ichthyopsida it is w-ithout any well-devel- oped external accessories for protection ; ^ but in the amniotes. a n sh Fig. SS. Horizontal section through human eye, from Hertwig after Arlt. i-', arteria centralis: a:, anterior chamber of eye; t, cornea; ch, choroid: cj, conjunc- tiva; i/, ciliary process; i, iris ; /, lens; m, macula lutea, point of distinct vision: K, optic ner\'e ; ff, ora serrata: /, papilla of optic nerve; /('. posterior chamber of eve; r, retina: .â , sclerotic; sh, sheath of optic nerve; f, vitreous body; _, zonula. Zinnii. movable lids, which can close o\er the organ, occur. There are typically three of these folds of the skin, â an upper and a lower lid, moving in a vertical plane, and inside of these a third transparent lid, the nictitating membrane, which is attached at the anterior or inner angle, and which closes horizontally. In 1 Some salamanders have feebly developed Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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