244 CYPEINIDiE. 



b. Phan/nycal teeth in a single series (Algansea). 



46. Leuciscus tincella. 



Leuciscus tincella, Cuv. ^ Val. xvii. p. 323. 



Algansea tincella, Girard, Proc. Ac. Nat. So. Philad. 1856, p. 183 ; 

 and U. S. ^ Max. Bound. Ichthyol. p. 46, pi. 27. figs. 1-4. 



D. 1/9. A. 1/8. L. lat. 70. L. transv. 15/12. 



The height of the body is nearly equal -to the length of the head, 

 which is one-fourth of the total (without caudal). Snout of mode- 

 rate extent, longer than the eye. Mouth anterior; slightly oblique, 

 with the jaws nearly even in front ; the maxillary does not reach 

 the vertical fi'om the front margin of the orbit. Origin of the dorsal 

 fin midway between the end of the snout and the root of the caudal, 

 opposite to the origin of the ventrals. Anal fin higher than long ; 

 caudal emarginate. Coloration uniform. 



Pharyngeal teeth 4 — 4. 



Mexico. 



47. Leuciscus obesus. 



Algansea obesa, Girard., Proc. Ac. Nat. Sc, Philad. 1856, p. 183 ; and 

 U. S. (§• Pac. a. R. Exped. Fish. p. 239. 



D. 2/9. A. 2/8. V. 9. 



Fourteen longitudinal series of scales between the origin of the 

 dorsal fin and the lateral line, and eight between the lateral line and 

 the root of the ventrals. The height of the body is about one-third of 

 the total length (without caudal) ; the diameter of the eye is nearly 

 one-sixth of the length of the head ; the maxillary does not reach 

 the vertical from the front margin of the orbit. The origin of the 

 dorsal fin is nearly opposite to that of the ventrals, and nearer to the 

 root of the caudal than to the end of the snout. Coloration uniform. 



Pharyngeal teeth 4 or 5 — 5 or 4, cul triform. {Girard.) 



Humboldt River. 



48. Leuciscus atrarius. 



Siboma atraria, Girard, Proc. Ac. Nat. Sc. Philad. 185j6, p. 208 ; U. S. 



Sr Ihtc. M. R. Exped. Fish. p. 297. 

 Algansea atraria, Gill, Proc. Ac. Nat. Sc. Philad. 1865, p. 70. 



D. 2/9. A. 2/8. V. 9. 



Eleven longitudinal series of scales above the lateral line, and six 

 between it and the root of the ventrals. The length of the head is 

 a little less than one-fourth of the total (with the caudal) ; the 

 diameter of the eye is two-elevenths of the length of the head. 

 The maxillary does not reach the vertical from the front margin of 

 the orbit. The origin of the dorsal fin is '^earer to the root of the 

 caudal than to the end of the snout, and opposite to the origin of the 

 ventrals. The pectoral fins terminate at a great distance from the 

 ventrals, which do not extend to the vent. Upper parts densely 

 marbled with black. (Girard.) 



Pharyngeal teeth 5 — 5. 



Utah. 



