1. CATOSTOMrS. 17 



Snout scarcely projecting beyond the mouth. Eye small. Scales 

 on the fore part of the trunk equal in size to those on the tail. 

 Lakes Erie and Superior. 



8. Catostomus occidentalis. 



Castostomus occidentalis, Ayra, in Proc. Calif. Ac. Nat. Sc. i. 1854, 

 p. liS ; Af/assiz, in Amer. Joi/rn. Sc. ^ Arts, xix. 1854, p. 94 ; Girard, 

 in U. S. P. R. R. Exi)ed. Fish. p. 224. 



Closely allied to C. teres. 



D. 14. A. 8-9. L. lat. 70. L. transv. ^}?. 



14-1.3 



The height of the body is less than the length of the head, which 

 is contained four times and three-fourths in the total (without 

 caudal). Lips broad, slightly papillose, the lower deeply bilobate. 

 Eye small, but little behind the middle of the length of the head ; 

 suborbital narrow, much narrower than the fleshy part of the cheek 

 below it. There are nine or ten longitudinal series of scales between 

 the lateral line and the root of the ventral. Scales on the fore part 

 of trunk much smaller than those on the tail. Origin of the dorsal fin 

 a little nearer to the end of the snout than to the root of the caudal. 



California. 



a-6. Adult. San Francisco. Presented by W. O.Ayres, Esq., M.D. 



9. Catostomus bemardini. 



Catostomus bemardini, Girard, Proc. Ac. Nat. Sc. Philadi 1850, 

 p. 175, and in U. St. ^- Me.v. Bound. Survci/, Ichthyol. p. 40, pi. 23. 

 figs. 1-5. 



This species is but little known, and very doubtful. 

 D. 14. A. 9. 



Apparently closely allied to C. teres, but with the eye larger and 

 in the middle of the length of the head (acpording to figure). Scales 

 apparently of the same size af in C. teres, those on the fore part of 

 the trunk being smaller than hose on the tail. The- height of the 

 body is nearly equal to the length of the head, and two-ninths of the 

 total (without caudal). Lips very thick, papillose, the lower deeply 

 bilobate. (Gir.) 



San Bernardino, in an affluent of the river Huagui, Mexico. 



10. Catostomus nigricans. 



Catostomus nigricans, Lesiieur, I. c. p. 102; Kirtland, Bost, Journ. Nat. 

 Hist.x.^. 273, pi. 21. fig. 3. 



maculosus, Lesueur, I c. p. 103. 



fasciolaris, flexuosus, megastomus, xanthopus, Rajinesque. 



Exoglossum macropterum, Rqfinesqne. 

 Hj'pentelium macropterum, Rqfinesqne. 

 Catostomus planiceps, Cnv. 8,- Val. xvii. p. 450, pi. 516. 

 IlYlomyzon nigricans, Agassiz, I. c. p. 90. 



D. 13. A. 8-9. L. lat. 48. L. transv. 6|-/9. 



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



VOL. VII. c 



