57. CTi;>'OPHARYNGODON. 261 



thrice and one-third in the length of the head. Pectorals jnst 

 reaching ventrals. Lateral line complete. There are three longi- 

 tudinal series of scales between the lateral line and the root of the 

 ventral fin. Coloration uniform, darkish on the root of the tail. 

 (Co2w.) 



Grosso Isle, Detroit lliver. 



84. Leuciscus heterodon. 



Alburnops heterodon, Cope, Proa. Ac. Nat. Sc. Philad. 1864, p. 281. 

 Ilj'bopsis heterodon. Cope, Journ. Ac. Nat. Sc. Philad. xiii. p. 382. 



D. 9. A. 8. V. 8. L. lat. 36. L. transv. 5/?. 



Lateral line incomplete posteriorly. There are three longitudinal 

 series of scales between the lateral line and ventral fin. The length 

 of the head is nearly equal to the height of the body, and about one- 

 fourth of the total length (\Wthout caudal). The diameter of the eye 

 is one-third of the length of the head. 8nout rather pointed ; mouth 

 anterior, oblique, with the lower jaw slightly projecting. Origin of 

 the dorsal fin nearer to the end of the snout than to the root of the 

 caudal. Pectorals terminating at a great distance from the ventrals. 

 A dark lateral band runs from the snout to the caudal fin. {^Cope.) 



Pharyngeal teeth 4 — 4. 



Lansing ; Grosse Isle. 



57. CTENOPHARYNGODON. 



Ctenopharvngodon, Stvindachner, Verh. zool.-bot. Ges. Wien, 1866, 

 p. 782. ' 



Body oblong. Scales of moderate size; lateral line complete, 

 running nearly in the middle of the side of the tail. Dorsal fin 

 short, without spine, opposite to the ventral ; anal fin short. Mouth 

 of moderate width, anterior, with the upper jaw somewhat longer. 

 Both jaws with simple lips, the lower distinct at the angle of the 

 mouth only. Upper jaw slightly protractile. Barbels none. Gill- 

 rakers rather short, lanceolate, rather widely set. Pseudobranchia;. 

 The attachment of the branchial membrane to the isthmus takes 

 place behind the vertical from the orbit. Pharj-ngeal teeth 5 . 2 — 

 2 . 4, those of the outer series very strong, strongly compressed, 

 with the outer layer deeply folded. 



China. 



] . Ctenopharyngodon idellus. 



Leuciscus idella, Cuv. iS- ]'al. xvii. p. o()2 (faulty description) ; Rich- 

 ardson, Ichth. Otin. p. 2t)7. 



tschiliensis, Basilcwsly, Nouv. Mem. Sue. Nat. 3Iosc. x. 1855, 



p. 23.3. 



Ctenopharyngodon laticeps, Steindachner, I. c. tab. 18. figs. ]-o. 



D. 10-11. A. 11. V. 10. L. lat. 40-42. L. transv. 7/8. 

 The height of the body equals the length of the head, and is a 

 little less than one-fourth of the total (without caudal). 8uout 



