22 CTPRINID^. 



out caudal), the length of the head two-ninths. Lips corrugated, 

 the upper narrow, the lower rather broad and bilobate. Eye very 

 small, situated a little nearer to the end of the snout than to that of 

 the opcrclo ; suborbital narrow. Scales on the fore part of the trunk 

 smaller than those of the tail. 



Pharyngeal teeth with slender base and broader much compressed 

 crown, the upper margin being oblique and terminating in an unci- 

 nate projection. 



United States. 



a. Half-grown. Mobile. Presented by Th. Moore, Esq. 



3. SCLEROGNATHUS *. 



Catostomus, sp., Lesueiir. 

 Sclerognathus, sp., Cuv. ^ Val. xvii. p. 472. 



Bubalichtliys, Iclithyobus et Cycleptus, Hafinesque 8c Agassiz, in 

 Amer. Journ. Sc. ^ Arts, xix. 1855, pp. 77-82 f. 



Scales of moderate or rather large size. Lateral line running along 

 the middle of the tail. Dorsal fin much elongate, with aboiit thirty 

 or more rays, none of which are spinous. Anal fin short (see Set. 

 asiaticus). Mouth small, inferior or terminal, with the lips more or 

 less thickened. Barbels none. Gill-rakers long, stiff in the upper 

 two-thii'ds of the first branchial arch, modified into low membra- 

 naceous transverse folds in the lower third. Pseudobranchife. 

 Pharyngeal bones sickle-shaped, armed Avith a comb-like series of 

 numerous compressed teeth, increasing in size downwards. 



Temperate and subtroi)ical parts of North America ; North China. 



Two types may be distinguished in this genus : — 

 u. Mouth inferior : Bubalichtliys, p. 22. 

 ^. Mouth terminal : Sclerognathus, p. 24. 



a. Buhalichthys. 



1. Sclerognathus urus. 



Catostomus bubalus, Kirtland, Bost. Journ. Nat. Hist. v. p. 266, pi. 19. 



%. 2. 

 Carpiodes urus, Agassiz, in Amer. Journ. Sc. 4* A7-ts, xvii. 1854, p. 355. 



taurus, Agassiz, I. c. 



? vitulus, Agassiz, I. c. p. 356. 



* 1. Carpiodes tumidus, Baird &c Girard, Proc. Ac. Nat. Sc. Philad. 1854, 

 p. 28 ; Intiobus tumidus, Girard, in V. S. ^ Mex. Bound. Survey, 

 lehthyol. p. 34, pi. 19. figs. \-A. — Fort Brown, Texas. Mouth inferior. 



2. damalis, Girard, in Proc. Ac. Nat. Sc. Philad. 1856, p. 218, pi. 48. 



figs. 1-4. — Milk Eiver, Upper Missouri. Mouth inferior, 

 t Agassiz has published a paper on these fishes, in which he refers his tri- 

 vial generic distinctions to Eafinesquian genera. If any evidence bad been 

 wanting to prove the miserable character of the publication of Rafinesque on 

 the Fishes of the Ohio, this paper would amply supply it. And yet the labours 

 of a Cuvier or a Valenciennes are to be superseded by it ! A careful examination 

 and dirtinction of the species of Catostomi is stUl much wanted, as the specific 

 characters offered in Agassiz's paper are quite insufficient. 



