CYPjaiNiD^. — cviii. 28T 



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

 extremity of the maxillary. 



t. Teeth with developed grinding sm-face; dorsal 

 fin directly over ventrals ; scales large ; head 

 broad, much depressed, nearly flat above, re- 

 sembling the head of a Gyprinodont. 



Platygobio, 19. 



tt. Teeth without grinding surfiice ; dorsal fin be- 

 ginning over, slightly before or slightly behind 

 ventrals; head not flattened. CERATicnTnYS,20. 



rr. Pr^maxillaries 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 wdiich is serrated 

 behind. 



v. Mouth without barbels teeth compressed, 4 — 4. (Garassunm.) 



Carassius, 23. 



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

 prinincB.) Cyprinus, 24. 



/. CAMPOSTOMA, Agassiz. Stoxe 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 



