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Page:Popular Science Monthly Volume 57.djvu/413

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CAUSES OF DEGENERATION IN BLIND FISHES.
PSM V57 D413 Photographs of the gradual decrease of the eye.png
Figs. 1-6.—Photographs of the upper halves of the heads of specimens of nearly the same length under the same magnification, to show the gradual decrease of the eye. The dotted line leads to the eye in all cases.
Fig. 1.Zygonectes notatus. Fig. 4.Ambliopsis spelitus.
Fig. 2.Chologaster papilliferus. Fig. 5.Troglichthys rosæ.
Fig. 3.Chologasiter Agassizii. Fig. 6.Typhlichthys subterraneus.