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CAUSES OF DEGENERATION IN BLIND FISHES.
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| 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. |
