lOO VERTEBRATE ANIMALS OF THE UNITED STATES 



ing the entire margin of the upper jaw; head naked; tail fin pointed 

 or rounded behind; scales small, cycloid, more or less imbedded so that 

 the body appears naked; no lateral line; anus close behind the gills; 

 fins spineless; ovary single; viviparous: 3 genera and 5 species; in small 

 streams along our southern coast, and also in subterranean streams, 

 these being blind and colorless. 



Key to the Genera of Amblyopsidae 



ai Eyes present and functional; ventral fin wanting. 



bi No tactile papillae present i. Chologaster. 



hi Tactile papillae present 2. Forbesella. 



as Eyes concealed; colorless, subterraneous species. 



bi Ventral fins present 3. Amblyopsis. 



hi Ventral fins wanting 4. Troglichthys. 



5. Typhlichthys. 



1. Chologaster Agassiz. Body very slender; eyes present; no ven- 

 tral fins; pyloric caeca 2: i species, in swamps and caves. 



Key to the Species of Chologaster and Forbesella 



ai Lateral papillary ridges absent. 



bi Three narrow latei-al stripes C cornutus. 



ho Body without stripes F. agassizii. 



a2 Papillary ridges present F. papilliferus. 



C. cornutus Ag. Length 60 mm.; head 3.4; depth 4.5; color dark 

 brown above; lower half abruptly white; whole body sprinkled with 

 black dots; 3 narrow lateral stripes present; rays of dorsal and anal 

 fins 8 or 9; scales 68: lowland swamps from Dismal to Okefinokee 

 Swamps; locally very common. 



2. Forbesella Jordan and Evermann. Tactile papillary ridges on 

 sides of body; eyes imperfectly developed; pyloric c^ca 2: 2 species; 

 cave fishes. 



F. agassizii (Putnam). Length 30 mm.; head 4; color light brown: 

 Mammoth Cave and other subterranean streams in Tennessee and 

 Kentucky. 



F. papillifera (Forbes). Length 30 mm.; head 4; depth 5 or 6; color 

 as in Chologaster cornutus; pectoral reaching half way to the dorsal fin; 

 head with rows of tactile papillae : caves in Union and Pope Counties, 

 Illinois. 



3. Amblyopsis DeKay. Eyes rudimentary and not functional; 

 body and head with many vertical tactile ridges; i pyloric caecum: i 

 species. 



