22 CTPRINID^, 



out caudal), the length of the heaS 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 opercle ; suborbital narrow. Scales on the fore part of the trunk 

 smaller than those of the taU. 



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., Lesiienr. 

 Sclerognathus, sp., Cuv. 8f Val. xvii. p. 472; 



Bubalichthys, Ichthyobus et Cycleptus, Rqfinesqiie 8f 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 about thirty 

 or more I'ays, none of Avhich are spinous. Anal fin short (see Scl. 

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

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

 two-thirds of the first branchial arch, modified into low membra- 

 naceous transverse folds in the lower third. Pseudobranchioe. 

 Phai'yngeal bones sickle-shaped, armed with a comb-like series of 

 numerous compressed teeth, increasing in size downwards. 



Temperate and subtropical parts of North America ; North China. 



Two types may be distinguished in this genus : — 

 «. Mouth inferior : BuhalicJitliys, p. 22. 

 /3. Mouth .terminal : Sclcrof/iiathus, ■p. 24:. 



a. BuhalicJithijs. 



1. Sclerognathus urns. 



Catostomus bubalus, Kirtland, Host. Jottrn. Naf. Hist. v. p. 2G6, pi. 19. 



fig- 2- 

 Carpiodes urus, Ayasmz, in Amer. Journ. Sc. Sf- Arts, xvii. 1854, p. 355. 



taurus, Aijasxiz, I. c. 



? vitulus, Af/assiz, I. c. p. 350. 



* 1. Carpiodes tumidus, Baird S( Girard, Proc. Ac. Naf. Sc. Philad. 1854, 

 p. 2S ; lotiobus tumidus, Girard, in U. S. cf Mcx. Bound. Survey, 

 Ichfhi/ul. p. ;>4, pi. 19. figs. 1-4, — Fort Brown, Texas. Mouth inferior. 

 2. - — damalis, Girard, in Proc. Ac. Nat. Sc. Philad. 18.56, p. 218, pi. 48. 

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

 t Agassiz has publislied a paper on these fishes, in which ho refers his tri- 

 vial generic distinotions to Rafinesquian genera. If any evidence had been 

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

 the Fi.slics of tlie Ohio, this paper would amj)ly supply' it. And yet the labours 

 of a. Cuvier or a Valenciennes are to be superseded by it !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

 and di.=tinction of the species of Cafosfomi is still much wanted, as the specific 

 characters offered in Agassiz's paper are quite insufficient. 



