. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. SENSE ORGANS. 171 (3) Meanwhile the infolding from the epidermal sur- face has formed the lens. (4) Then the optic vesicle becomes folded back upon itself like a double nightcap, so as to leave a large space between it and the lens. The anterior or back-folded layer of the double night- cap becomes the retina, and the posterior layer the choroid (Fig. 108, C). (5) The two folds come in con-. FlG. 108.—Diagram representing different stages in the development of the vertebrate eye :
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. SENSE ORGANS. 171 (3) Meanwhile the infolding from the epidermal sur- face has formed the lens. (4) Then the optic vesicle becomes folded back upon itself like a double nightcap, so as to leave a large space between it and the lens. The anterior or back-folded layer of the double night- cap becomes the retina, and the posterior layer the choroid (Fig. 108, C). (5) The two folds come in con-. FlG. 108.—Diagram representing different stages in the development of the vertebrate eye : C V, cerebral vesicle; O V, optic vesicle; r, retina; ck, choroid ; b, bacillary layer ; /", fibrous layer ; /, lens. tact and the vesicle is obliterated. The space between the concave retina and the lens is filled and forms the vitreous humor, the whole becomes encysted by the sclerotic, and the eye is finished. Now observe that the cerebral vesicle and the optic vesicle are lined with epithelium. When this is folded back the pos-. 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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