38. UYBOGNATHrS. 183 



1. Campostoma dubium. 



Exofrlossum dubiiuu, Kirtluml. Journ. Bost. Soc, Nat. Hist. v. p. 272, 



pi. 21. fi-. 1. 



.«tpiuieephalum, Cuv. Sr Val. xvii. p. 489. 



Leuci.scus prolixus, Storer, Proc. Sost. Soc: Nat. Hist. 1845, July ; 



Mem. yimar. Acad. Sc. ^ Arts, ii. 1840, p. 417. 

 Chondrostoma prolixiim, Ayassiz, in Amer. Journ. Sc. ^- Arts, xvii. 



18.54, p. 357. 



puUum, Agassiz, I. c. 



Campostoma aiiomaliim, {Rajin.) Ar/assiz, I. c. xix. 1855, p. 218. 



dubium, Cope, Journ. Ac. Nat. Sc. Philad. xiii. p. 396. 



? Campostoma callipteryx. Cope, Proc. Acad. Nat. Sc. Philad. 1864, 



p. 284. 



D. 9. A. 8. L. lat. 49-57. L. transv. ^. 



The height of the body is contained four times and a half or four 

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

 four times and one-third. Snout subconical, much longer than the 

 diameter of the eye, which is from two-sevenths to ono-fifth of the 

 length of the head, and e(]ual to, or much less than, the width of 

 the interorbital space. No lower lip. The origin of the dorsal fin 

 is midway between the end of the snout and the base of the caudal, 

 a little behind the origin of the ventral ; in old examples, in which 

 the snout is more elongate, the origin of the dorsal fin is compai-a- 

 tively nearer to the caudal. There are from five to seven longitu- 

 dinal series of scales between the lateral line and root of the ventral 

 fin. Coloration uniform or irregulaiiy mottled with black. Pha- 

 ryngeal teeth 4 — 4, 



United States. 

 a. Young. Burlington, Iowa. Presented by Th. Moore, Esq. 

 h. Fine specimen. Holston, Virginia. Pui'chased of Mr. Cope as 



C. anomaluin. 

 c-e. Fine specimens. Miami. Purchased of Mr. Cope as C. t/M^m*». 



2. Campostoma omatum. 



Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 176 ; U. St. ^-Mex. Bound. 

 Ichthjol. p. 41, pi. 25. figs. 1-4. 



D. 10. A. 10?. 



The length of the head is two-ninths of the total (without caudal). 

 Scales much smaller than in C. proli.vnm. Sides with scattered 

 black spots ; a black patch at the base of all the fins. (Girard.) 



Chihuahua lliver. 



38. HYBOGNATHUS *. 

 Dionda, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 176. 



* I. Hyborhynchus tenellus, Girard, Proc. Ac. Nat. Sc. Philad. 18.")6, p. 17'J ; 

 or r. S. &;■ Pac. N. Ii. Expcd. Fish. p. 231.— Choctaw Agency. 



2. punicous. Girard, II. cc. pi. 52. figs. 1-5, 11-15. — Llano Estacado and 



Canadian River. 



3. c'onfertus, Girard, II. cc. pi. .59. figs. 11-15. — Rio Pecos. 



4. Ilybognathus arpyritis, Girard, Proc. Ac. Nat. Sc. Philad. 18.56, p. 182, 



