CYPRINLD^E. CVIII. 287 



88. Teeth in the principal row 44; the barbel at the 



extremity of the maxillary. 



t. Teeth with developed grinding surface; dorsal 

 fin directly over ventrals; scales large; head 

 broadj much depressed, nearly flat above, re- 

 sembling the head of a Cypriiiodont. 



PLATYGOBIO, 19. 



tt. Teeth without grinding surface ; dorsal fin be- 

 ginning over, slightly before or slightly behind 

 ventrals ; head not 'flattened. CERATICHTHYS^O. 

 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. . . . RHIXICHTHYS, 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- 

 siwe.) 



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. (Carassuna.) 



CARASSIUS, 23. 



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

 prinince.) CYPKINUS, 24. 



/. CAMPOSTOMA, Agassiz. STONE LUGGERS. 



1. C. anoma/a, (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 



