CYPEINID^. — OVIII. 287 



ss. Teeth in the principal row 4—4; the barbel at the 

 extremity of the maxillary. 

 t. Teeth with developed grinding surface; dorsal 

 fin directly over ventrals ; scales large ; head 

 broad, much depressed, nearly flat above, re- 

 sembling the head of a Oyprinodont. 



Plattgobio, 19. 

 tt. Teeth without grinding surface ; dorsal fln be- 

 ginning over, slightly before or slightly behind 

 ventrals; head not flattened. Cbbatichthts,30. 

 rr. Premaxillaries not projectile, the skin of the lip 

 • continuous with that of the forehead ; teeth 3, 4 — 4, 

 2, without grinding surface ; dorsal behind ventrals ; 

 barbel terminal ; scales very small ; mouth more or 

 less inferior. . . . Rhinichthys, 21. 



tt Dentary bones straight and flat, united throughout their 

 length; mandible much incurved, tongue-like, a lobe on 

 each side of it at base ; air bladder normal ; bones of head 

 not cavernous; intermaxillaries not projectile. (Exoglos- 

 sinm.) 

 u. Teeth 1, 4 — 4, 1, hooked, without grinding surface ; dorsal 

 slightly behind ventrals ; no barbels. Exoglossum, 22. 

 ** Species introduced from the Old "World ; dorsal very long and 

 anal short, each preceded by a stout spine which is serrated 

 behind. 

 11. Mouth without barbels teeth compressed, 4 — 4. (Ga/rassiinm.) 



Cakassius, 33. 



m. Mouth with four long barbels ; teeth molar 1, 3—3, 1, (Cy- 



prininm.) Ctpbinus, 84. 



/. CAMPOSTOMA, Agassiz. Stone Luggbes. 



1. C. anomala, (Raf.) Ag. Stone Luggee. Stone 

 ROLLEE. Brownish, with a brassy luster above, the 

 scales more or less mottled with dark; a black vertical 

 bar behind opercle; iris usually orange-red; dorsal and 

 anal each with a dusky cross-bar about half way up, the 



