14 CrPEINID^. 



cl-e. Adult : stuffed. Albany River. 



f-g. Half-grown : stuffed. Arctic regions. Collected by J. llae, Esq. 



Forster knew and described one species only, which subsequently 

 received the name of hudsonius from Lesueur. As I know the 

 species examined by Forster, I am enabled to state that Richardson 

 and others erroneously applied that name to species with larger 

 scales. Pennant (Arch. Zool. i. p. cxcii) was the first to confound a 

 large- and a small-scaled species under the name given by Forster 

 to the latter. 



Agassiz (Lake Superior, p. 357) speaks of Forster's " second 

 variety," " upon consulting the original memoir or Forster." I am 

 unable to find anything in this memoir which would indicate that 

 Forster examined two varieties. 



2. Catostomus griseus. 



Catostomus (Acomus) griseus, Giranl, in Proc. Ac. Nat. Sc. Philad. 

 1856, p. 174, and in U. S. Pac. R. R. Exped. Fish. p. 222, pi. 49. 

 figs. 5-9. 



D. 13?. A. 10?*. 



Scales small. The height of the body is contained four times and 

 two-thirds in the total length (without caudal), the length of the 

 head four times and one-fourth. Lips papillose, thick, the lower 

 bilobed. Eye small, a little behind the middle of the length of the 

 head, the snout being much produced. Scales on the fore part of 

 the trunk conspicuously smaller than those on the tail. Pectoral 

 fin not extending to the vertical from the origin of the dorsal, which 

 is equidistant from the end of the snout and the root of the caudal. 

 {Oirard.) 



Sweetwater fork of Platte River. 



3. Catostomus latipinnis. 



Catostomus latipinnis, Baird 1^- Girard, Proc. Ac. Nat. Sc. Philad. 



1853, p. 388. 

 Acomus latipinnis, Girard, I. c. 1856, p. 173, and U, St. ^ Mex, 



Bound. Survey, IchtJii/ol. p. 39, pi. 24. tigs. 1-6. 



This species is evidently closely allied to O. hudsonius, from which 

 it ai')pears to differ in having longer pectoral fins. Probably the 

 specimens examined were males, with. longer fins than the females 

 have ; but none of the male specimens of the northern C. hudsonius 

 have the pectoral fins so much developed as C. latipinnis. 



D. 14. A. 9. 



Scales very small. The height of the body is contained five times 

 in the total length (without caudal), the length of the head four 

 times and two-thirds. Lips very thick, papillose, the lower deeply 

 bilobate. Eye small, nearly in the middle of the length of the head, 

 the snout being much produced. Suborbital very narrow. Pectoral 



* According to the letterpress ; the artist employed toillastrate Mr. Girard's 

 notes on these fishes appears to have counted differently. 



