CYPRINID.E. CVIII. 287 



88. 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. 



PLATYGOBIO, 19. 



U. Teeth without grinding surface ; dorsal fin be- 

 ginning over, slightly before or slightly behind 

 ventrals; head not flattened. CERATICHTHYS,SO. 

 rr. Premaxillaries not projectile, the skin of the lip 

 continuous with that of the forehead ; teeth 2, 4 4, 

 2, without grinding surface ; dorsal behind ventrals ; 

 barbel terminal ; scales very small ; mouth more or 

 less inferior. . . . RHINICHTHYS, 21. 

 ff 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- 

 since.) 



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. 



v. Mouth without barbels teeth compressed, 4 4. (Carassimce.) 



CABASSIUS, 23. 



vo. Mouth with four long barbels ; teeth molar 1, 33, 1, (Gy- 

 prinmce.) , CYPRINUS, 24. 



/. CAMPOSTOMA, Agassiz. STONE LUGGERS. 



1. C. anomala, (Raf.) Ag. STONE LUGGER. STONE 

 ROLLER. 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 



