CATALOGUE 



FISHES. 



Subclass I. TELEOSTEI. 



{CONTINUED.) 



Order IV. PHYSOSTOMI. 



{CONTINUED.) 



Fam. 16. HETEROPYGII. 



Heteropygii, Tellkavipf, Muller^s Archiv, 1844, p. 392, 

 Hypsseid*, StQver, Mem. A?ne}: Acad. ii. 1846, p. 435. 



Head naked, body covered with very small scales ; 

 barbels none. Margin of the upper jaw formed by 

 the intermaxiliaries. Villiform teeth m the jaws and 

 on the palate. Adipose fin none. Dorsal fin belong- 

 ing to the caudal portion of the vertebral column, 

 opposite to anal. Ventral fins rudimentary or absent. 

 Vent situated before the pectorals. Stomach vs^ith a 

 blind sac; pyloric appendages present. Pseudo- 

 branchiae none ; air-bladder deeply notched anteriorly. 



Caves of North America ; South Carolina. 



VOL. VII. B 



