. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. 176 BLIND VERTEBRATES AND THEIR EYES. without an intervening stage like that of cornutus, and the pigment layer has lost its pigment, whereas in Amblyopsis it was retained. The reduction in size from the normal fish eye went hand in hand with the. Fig. 66. Diagrams of Eyes of all Species of Amblyopddie and Typhlomolge, ,g h, and i drawn under same magnification, (a) Clwlogast:r cornutus, (b) Clwlogasler papillijerus, (c) Chologaster agassizii, drawn to scale; (rf) Retina of Chologaster cornulus; (c)
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. 176 BLIND VERTEBRATES AND THEIR EYES. without an intervening stage like that of cornutus, and the pigment layer has lost its pigment, whereas in Amblyopsis it was retained. The reduction in size from the normal fish eye went hand in hand with the. Fig. 66. Diagrams of Eyes of all Species of Amblyopddie and Typhlomolge, ,g h, and i drawn under same magnification, (a) Clwlogast:r cornutus, (b) Clwlogasler papillijerus, (c) Chologaster agassizii, drawn to scale; (rf) Retina of Chologaster cornulus; (c) Retina of Chologaster papillijerus; (/) Eye of Typhlo- molge under lower magnification than d-j\ (g) Eye of Typhlichlhyssubterraneus; (h) Eye of Amblyopsis speleeus; (») Eye of Troglichthys rosa. simplification of the retina. There was at first chiefly a reduction in the number of many times duplicated parts. Even after the condition in Chologaster papillij- erus was reached the degeneration in the histological condition of the elements did not keep pace with the reduction in number (vide the eye of cornutus). The. 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 Eigenmann, Carl H. , 1863-1927. Washington, D. C. , Carnegie Institution of Washington
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