CAVE FISHES OF NORTH AMEKICA. 



389 



darkest, consequently the sides and upper part of the body appear 

 gray. There is an ill -defined dark spot at the base of the caudal 

 and there are dark lines on the body at the base of the dorsal and 

 anal fins. The fins vary in color from light gray to white, belly 

 white. Length 2 in. 



This rare fish was first described by Putnam in 1872 from a well 

 near Lebanon, Tenn., and it has very rarely, if ever, been taken since, 

 so far as I am able to determine, until November, 1898, when Dr. 

 C. H. Eigenmann secured 4 specimens from Mammoth Cave and 

 Cedar Sinks, Kentucky. The chief points which distinguish this from 

 the other species of the genus are the smaller eye and the lighter color. 

 Tactile ridges are present, but they are not so prominent as in C. 

 pap'dtiferus. The fish is not found outside of caves or underground 

 streams. The specimens examined were those from Mammoth Cave 

 and Cedar Sinks, Kentucky. 



Measure m axis. 



Chologaster agassizli Putnam, Amer. Nat., VI, 1872, 22, well at Lebanon, Tenn., 

 Mammoth Cave, Ky. Jordan, Eept. Geol. Nat. Res. of Indiana 1874 (1875), 

 VI, 218 (reference to Putnam's specimens). Hay, Geol. and Nat. Res. of 

 Ind., XIX, 1894, 234. Jordan & Evermann, Fishes North and Mid. Amer., 

 I, 704, 1896. Eigenmann, Proc. Ind. Ac. Sci. 1897 (1898) , 230; Eyes of the Bhnd 

 Vertebrates of N. A., Archiv. f. Entwickelungsmech., VIII, 1899, 546; Proc. 

 Ind. Ac. Sci., 1898 (1899), 239, 251; Marine Biological Lectures, 1899 (1900), 113. 



/ TYPHLICHTHYS Girard. 



Ti/phliclitltys Girard, Proc. Ac. Nat. Sci., Phila., 1859, 62 {subterraneus) . 



No ventral fins present. Otherwise similar to Amblyopsis^ except 

 that it does not grow to be so large. The genus includes probably 

 three species. 



Typhlichtliys subterraneus Girard. PL V, fig. 1. 



Body a little heavier than in Chologaster^ its depth 6 to 6.5 in the 

 length; head much depressed, 3 to 3.5 in the length; mouth large, 

 oblique, lower jaw a little projecting, snovit broad and rounded; eye 

 entirel}' covered; gill cavities somewhat enlarged ; gill membranes united 

 to the isthmus; branchiostegals 6, fitting closel}" to the body, reaching 

 back to the vent; pectoral fins 1.5 in head; front of anal a little back 

 of front of dorsal; anal with 8 rays; dorsal 8; caudal rounded in per- 

 fect specimens; scales similar to those of Chologaster ; pyloric coeca 2. 



