392 EEPOET OF THE COMMISSIONEK OF FISHERIES. 



TyphUchthys subterrancus Garinan, Bull. Mus. Com. Zool., XVII, 1889, 232 (wells 

 and caves, Jasjier County, Missouri) ; not of Girard. Kohl, Rudimentilire 

 AVirbelthieraugen, 1892, 59. 



TypJdtchUiys rosx Eigenmann, Proc. Ind. Ac. Sci., 1897 (1898), 231, Sarcoxie, Mo. 



Trogllcthys rosx, Eigenmann, Science, N. S.,^X, 1899, 280 (Day's Cave, Sarcoxie, 

 Missouri); Degeneration in the Eyes of the Amblyopsldx, its Plans, Processes 

 and Causes, Proc. Ind. Ac. Sci., 1898 (1899), 239 (summary); Eyes of the Blind 

 Vertebrates of N. A., Archiv. f. Entwickelungsmech., VIII, 1899, 573; A Case 

 of Convergence, Proc. Ind. Ac. Sci., 1898 (1899), 247. 



AMBLYOPSIS Be Kay. 



Amblyopsis De Kay, Nat. Hist. N. Y., Reptiles and Fishes, 187, 1842 (spelsciis). 



Unlike the other g-enera of this family, AmhJyopsis possesses ventral 

 fins. The eyes are concealed under the skin and are not at all func- 

 tional. The head as well as the body is furnished with regularly 

 arranged rows of tactile papilhw P3doric coeca generall}^ 2, but some- 

 times 3. 



Amblyopsis spelasus De Kay. Plate VI. 



The body of Arnhlyojysis is heavder than the other members of this 

 famil}^; depth in length, 4 to 5; head, 3, depressed like that of Typh- 

 lichthys; mouth not so obliquely set as in the other members of the 

 family; premaxillary not protractile; 63^6 just visible through the skin 

 in the j^oung, not visible in the adult; gill-cavities enlarged, probably 

 on account of the breeding habits of AmMyojysis"/ pectoral contained 

 1.7 in head; anal rounded, with 8 to 10 rays; dorsal, with 8 to 10 ra3^s, 

 inserted slightly in front of anal, similar to it in shape. The variation 

 of the rays in these 2 fins depends on the short rays at the front of 

 each. These are ver3^ small and are covered b3^ the fat skin, so as not 

 to be seen from an external examination. Caudal fin broad, slightly 

 pointed at tip; ventrals very small, inserted so that their posterior 

 margins reach front of anal, ra3^s about 4 in each fin. Fatty enlarge 

 ments present at bases of all the fins, but more especially' the dorsal, 

 anal, and ventral; p3'loric ca?ca 2 to 3; scales small and arranged 

 irregularl3^, similar to those of Chologaster. Body colorless. In life 

 the color is a rosy, purplish hue, due to the blood vessels which show 

 through the skin; alcoholic and formalin specimens, 3'ellowish white; 

 no evidence of pigment anywhere on the surface. Length, 5 inches. 



This species is known south of the Ohio River from Mammoth Cave 

 and its vicinity QxAy. North of the Ohio it has been found in a num- 

 ber of caves from Little Wyandotte, near the Ohio, to Hamers and 

 Donnelsons caves, near the East Fork of the White River. It has 

 become veiy rare in and about Mammoth Cave. The specimens exam- 

 ined were one from Mammoth Cave, a large numl»er from Donnelsons 

 Cave, and one from Hamers Cave. 



"Eigenmann, Marine Biological Lectures, 1900, for 1899, 113. 



