CARPS. 835 



/. Teeth in the main low 4-4. 

 g. Maxillary without barbel. 

 h. Teeth 4-4 or 1, 4 4, 1 or 0. 

 i. Bones of head without oavernons chambers ; lips thin ; teeth with grind- 

 ing surface. 



fc. Lateral line complete Hudsonius. 31. 



hk. Lateral line incomplete Chriopb. 33. 



kh. Teeth 2, 4-4, 2. 



I. Teeth without grinding surface ; lateral line complete ; anal basis rather 



long. ...... MiNNiLus. 33. 



II. Teeth with grinding surface ; lateral line complete. 



m. Dorsal fin inserted well behind ventrals ; anal basis long (rays 10 

 to 13). ..... Lythrurus. 34. 



mm. Dorsal fln inserted over or a little behind ventral ; anal basis short 



(rays 7 to 9) Luxilus. 35. 



ii. Snborbitil, interopercle and dentary bones much dilated, cavernous, 

 crossed by mucous channels (readily seen by looking at the head of 

 the fish from below ; teeth 1, 4-4, 0, . . Ericymba. 36. 



tit. Lips thick, fleshy, the lower enlarged behind ; mouth small, inferior ; 

 teeth 4-4, wiihoat grinding surface. . . Phbnacobius. 37. 

 gg. Maxillary with a small barbel at or near its extremity (sometimes minute 

 in Bhinichthys). 

 n. Upper jawnot protractile ; scales small; dorsal behind ventrals. 



Rhinichthys. 38, 

 mn. Upper jaw protractile. 

 0. Teeth 1,4-4, 1 or 4 4. 

 p Teeth with grinding surface, 4-4; body elongate. . Erimystax. 39. 

 pp. Taeth without grinding surface. . . . Ckratichthys. 40. 

 00. Teeth 2, 4-4, 2, without grinding surface. . . CouKSius. 41. 

 ff. Teeth 2, 5-4, 2 or 1, or 2, 5-5, 2, without grinding surface. 



q. Maxillary with a minute, lateral barbel (obscure or invisible in young speci- 

 mens) ; scales moderate or large Sbmotilus. 42. 



.qq Maxillary without barbel ; scales small. 

 r. Lateral line complete. .... Telbstbs. 43. 



rr. Lateral line incomplete. .... Phoxinus. 44. 



tt Abdomen behind ventral fin compressed to an edge ; anal basis elongated. 

 s. Teeth 5-5, with grinding surfice; lateral line complete ; anal rays 10 to 18, 



NOTEMIOONDS. 45. 



**Speoies introduced from Asia through Europe, with long dorsal fin preceded by a 

 serrated spine. 

 t. Barbels none. ...... Carassius. 46. 



it. Barbels four, ...... Cyprinus. 47. 



Genus 25. CAMPOSTOMA.. Agassiz. 



Campoatoma, Agassiz, Am. Journ. Sol. Arts, 1855, 219. 

 Type, Butilns anomalas, Eafinesqne. 

 Etymology, kampe, curve ; stoma, mouth. 



