56. LETJCISCTJS. 239 



II. Ainerican Species. 



A, More thatijifti/ scales in the lateral line. 



1. The dorsal Jin commences above, or hit little in advance of, the root 

 of the ventrals. 



a. Pharyngeal teeth in ttvo series. 



36, Leuciscus gi'andis. 



Gila grandis, Ayres, Proc. Calif. Acad. Nat. Sc. 1854, p. 18. 



? Ptychocheilus major, Agass. Sillim. Journ, 1855, xix. p. 229 (with- 

 out specific description). 



grandis, Girard, U. S. ^ Pac. R. R. Exped. Fish. p. 299. 



? Ptychocheilus rapax, Girard, Proc. Acad. Nat. Sc. Philad. 1856, 

 p. 209 ; and. U. S. 8,- Pac. R. R. Exped. Fish. p. 300, pi. 65. 



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

 and U. S. S,- Mex. Bound. Ichthyol. p. 65, pi. 34. figs. 1-4. 



D. 10. A. 11. V. 10. L. lat. 78-92. L. transv. '^^. 



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 

 c? that of the postorbital part of the head. Mouth subhorizontal, 

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

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

 orbital bones narrow, the -praeorbital being much longer than the 

 eye and nearly t^^ice 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 praeoperculum and base of the cmdal. 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. 

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

 membrane to the iisthmus takes place somewhat in advance of the 

 posterior prseopercular margin. 



California. 



a-b. Fourteen incnes long. San Francisco. Presented by Dr. W. 

 O. Ayres. 



37 Lucisdas oregonensis. 



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



p. 305. 

 ? Ptychocheilus gracilis, Agassiz, in Sillim. Journ. 1855, xix. p. 229 



(without specific description). 

 Ptychocheilus oregonensis, Girard, in U. S. <^- Pac. R. R. Exped. 



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 candal), the length of 



