. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Evolution. 176 BLIND VERTEBRATES AND THEIR EYES. without an intervening stage lilce that of cormUus, 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. mmm h Fig. 66. Diagrams of Eyes of all Species of Arablyopsid* and TyPMomolg,-. d c g h, and , drawn under same magnification, (.a) Cko!og,2~l; corn^lm, (.b) Clwlogaster papMilcrus, (0 «^ "«a«.i". dra«a to scale; (rf) Relma oi Cholo^aUer cornul
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Evolution. 176 BLIND VERTEBRATES AND THEIR EYES. without an intervening stage lilce that of cormUus, 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. mmm h Fig. 66. Diagrams of Eyes of all Species of Arablyopsid* and TyPMomolg,-. d c g h, and , drawn under same magnification, (.a) Cko!og,2~l; corn^lm, (.b) Clwlogaster papMilcrus, (0 «^ "«a«.i". dra«a to scale; (rf) Relma oi Cholo^aUer cornulus: (f) Relma of UuMgaMr papdhjcrus- (Q i-ye of lyPMo,- molgc under lower magnification than d-/; («) Eye of TypUichthys subterrancus; (k) Eye of Amblyopsts spdaus; {i) Eye ol Troglichtkys 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 papillif- 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 cornntus). 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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