56. LEUCI8CUS. 239 



II. Autericun Species. 



A. More thanjifiij scales in the lateral line. 



1. The dorsal Jin commences above, ur but little in advance of, the root 

 of the ventrals. 



a. Pharyngeal teeth in two series. 



3(). Leuciscus gi'andis. 



Gila grandis, Ai/res, Proc. Calif. Acad. Nat. Sc. 1854, p. 18. 



? Pt3'choclieilus maior, Ayass. Sillitn. Journ, 1855, xix. p. 229 (with- 

 out specific description). 



grandis, Girurd, U. S. 8f Pac. R. R. Exped. Fish. p. 299. 



? I'tvclioclieilus rapax, Girard, Proc. Acad. Nat. Sc. Philad. 1856, 

 p." 209 ; and U. S. ^- Pac. R. R. Exped. Fish. p. .300, pi. 65. 



PtycliocheLlus lucius, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 209; 

 and U. S. ^- 3Iex. Bound. Ichthyol. p. 65, pi. 34. fig-s. 1-4. 



D. 10. A. 11. Y. 10. L. lat. 78-92. L. transv. 1^. 



16-13 



Head and body low and elongate ; the height of the body is con- 

 tained five times and a half in the total length (without caudal), the 

 length of the head thrice and two-thirds. Head at least twice as 

 long as deep, the width of the interorbital space (which is slightly 

 convex) being less than the length of the snout. Eye small, its 

 diameter being one-third of the length of the snout, and two-ninths 

 of that of the postorbital pait of the head. Mouth subhorizontal, 

 large, the maxiUary extending to behind the vertical from the front 

 margin of the eye. Jaws even in front. Lips well developed. Sub- 

 orbital bones narrow, the prteorbital being much longer than the 

 eye and nearly twice as large as the postorbital. The origin of the 

 dorsal fin is opposite to the middle of the root of the ventral fin, and 

 midway between the prseoperculum and base of the caudal. Caudal 

 fin forked. There are eight or ten longitudinal series of scales 

 between the lateral line and ventral fin. Coloration uniform. 



Pharyngeal bones slender, narrow, with two series of subconical 

 teeth, pointed and slightly hooked at the extremity, 4 . 2 — 2 . 4. 

 Gill-rakers very short, few in number. The attachment of the gill- 

 membrane to the isthmus takes place somewhat in advance of the 

 posterior prajopercular margin. 



California. 

 a-h. Fourteen inches long. San Francisco. Presented by Dr. W. 

 0. Ayres. 



37. Luciscus oregonensis. 



Cvprinus (Leuciscus) oregonensis, Richards. Faun. Bor.-Amer. Pise. 



■p. 305. 

 ? Ptychoclieilus gi-acilis, Ayassiz, in Sillim. Journ. 1855, xix. p. 229 



(without specific description). 

 Ptvchocheilus oregonensis, Girard, in U. S. c^j- Pac. R. R. Erped. 

 Fish. p. 298, pi. 64. figs. 5-9. 



D. 10. A. 10. V. 9. L. lat. 73. L. transv. 14/14. 

 Head and body low and elongate ; the height of the body is con- 

 tained five times in the total length (without caudal), the length of 



