286 FISHES. 



(oo. Semotilus corporaUs with a black spot at the 

 base of the dorsal in front, and S. hiiUarts a 

 large species with large scales, have the bar- 

 bel so minute as to be easily overlooked; 

 they may therefore be looked for here.) 



Semotilus, 18. 



{ooo. Phoxinus margaritus, with small scales, a 

 small, horizontal mouth, and short, rounded 

 head, has the lateral line so nearly com- 

 plete that it may be looked for here.) 



Phoxinus, 16. 



nil. Anal basis elongate, of 12 to 15 rays; teeth 

 5 — 5, with grinding surface and the edges cre- 

 nate-serrate ; belly sub-carinate ; body deep, 

 much compressed, with small head, small, 

 oblique mouth, and the lateral line greatly 

 decurved ; alimentary canal elongate. 



NOTEMIGONUS, 14. 



gg. Lateral line incomplete or wanting. 



p. Dorsal behind ventrals ; scales very small ; mouth 

 oblique. 



q. Teeth 4 — 5 or 5 — 5, with grinding surface; ali- 

 mentary canal elongate. Chrosomus, 15. 



qq. Teeth 1 or 2, 5 — 4, 1 or 2, without grinding sur- 

 face; alimentary canal short; body short and 

 thick Phoxinus, 16. 



2)p. Dorsal over ventrals ; scales large ; teeth 4 — 5, 

 (rarely 4 — 4) with grinding surface; alimentary 

 canal short. . . . Hemitiiemta, 17. 



dd. Maxillary provided with a small — often very minute 

 —barbel; alimentary canal short; teeth hooked. 



r. Premaxillaries projectile, the skin of the lip separ- 

 ated by a groove from that of the forehead. 



s. Teeth two-rowed, the principal row 4 — 5, without 

 grinding surface; barbels minute, just above 

 the angle of the mouth ; size large, dorsal fin in- 

 serted more or less backwards. Semotilus, 18. 



