274 FISHES. 



elongate species of small size, resembling young 

 suckers ; teeth 4-4, hooked, sharp-edged. 



PHENACOBIUS, 10. 



5. Intermaxillaries not projectile, the skin of lip and 



forehead being continous ; small dark species with 

 60 or more scales in the lateral line. 



RHINICHTHYS, 9. 



6. Scales high, closely imbricated ; body compressed, 



silvery ; dorsal with a black blotch behind ; snout 

 with small tubercles and fins with satiny pigment 

 in spring; teeth 1, 4-4, 1. . . PLARGYRUS, 18. 



7. Small fishes silvery or plumbeous, with none of the 



preceding combinations. 



o. Jaws with sharp cutting edges ; intestines much con- 

 voluted, about four times the length of the head and 

 body; peritoneum black; size moderate; scales 

 brightly silvery ; teeth 4-4, with oblique mastica- 

 tory surface and no hook. . HYBOGNATHUS, 5. 



oo. Jaws not trenchant ; intestines not longer than head 

 and body ; peritoneum pale ; scales various, rather 

 large; small, weak species; teeth one or two- 

 rowed, inner series 4-4. . . HYBOPSIS, 11. 



** Introduced species ; dorsal very long and anal short, each 

 being preceded by a stout spine which is serrated behind. 



p. Mouth with four long barbels; teeth molar 3, 1-1, 3. 



CYPRINUS, 23. 

 pp. No barbels ; teeth compressed, 4-4. . CARASSIUS, 22. 



/. EXOGLOSSUM, Rafinesque. STONE TOTEES. 



1. E. maxil lingua, (LeS.) Haldeman. DAY CHUB. 

 CUT - LIPS. NIGGER CHUB. Body stout ; depth 4 in 

 length, head 4; eye small, nearly 5 in head; dorsal be- 

 hind midway between snout and caudal ; dusky above, 

 a blackish shade along caudal peduncle; D. I, 8; A. I, 8; 

 lat. 1. 50 to 55; L. 4 to 6. W. N. Y. (Susquehanna basin) 



