392 REPORT OF THE COMMISSIONER OF FISHERIES. 



Typhlichthys subterrancus Garman, Bull. Mas. Com. Zool., XVII, 1889, 232 (wells 

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

 Wirbelthieraugen, 1892, 59. 



Typlilichlhys rosie Eigenmann, Proc. Ind. Ac. Sci., 1897 (1898), 231, Sarcoxie, Mo. 



Trogliclhys rosx, Eigenmann, Science, N. S.,-iX, 1899, 280 (Day's Cave, Sarcoxie, 

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

 and Causes, Proc. Ind. Ac. Sci., 18*98 (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 De Kay. 

 Amhlyopsis De Kay, Nat. Hist. N. Y., Reptiles and Fishes, 187, 1842 {spelxus). 



Unlike the other genera of this family, Amhlyopsis possesses ventral 

 fins. The e3^es are concealed under the skin and are not at all func- 

 tional. The head as well as the bod}' is furnished with regularly 

 arranged rows of tactile papilhe. Pjdoric ca^ca generally 2, but some- 

 times 3. 



Amblyopsis spelseus De Kay. Plate VI. 



The body of Anihhjopsls is heavier than the other members of this 

 famil}^; depth in length, -i to 5; head, 8, depressed like that of Typli- 

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

 family; premaxillary not protractile; eye just visible through the skin 

 in the young, not visible in the adult; gill-cavities enlarged, probably 

 on account of the breeding habits of Amhlyoj)sis'^ ; pectoral contained 

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

 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 ver}' small and are covered by the fat skin, so as not 

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

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

 margins reach front of anal, ra^^s about 4 in each fin. Fatt}' enlarge 

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

 anal, and ventral; pjdoric coeca 2 to 3; scales small and arranged 

 irregularly, similar to those of Chologaster. Body colorless. In life 

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

 through the skin; alcoholic and formalin specimens, j^ellowish white; 

 no evidence of pigment an3'where on the surface. Length, 5 inches. 



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

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

 ber of caves from Little W3'andotte, near the Ohio, to Hamers and 

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

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

 ined were one from Mammoth Cave, a large num})er from Donnelsons 

 Cave, and one from Hamers Cave. 



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



