182 CTPEIKID^. 



1. Hyborhynchus notatus. 



Agassiz, I. c. ; Coj^e, Journ. Ac. Nat, Sc. Philad. xiii. p. 392, pi. 13. 

 iig. 5. 



D. 1/8. A. 8. V. 8. L. lat. 45. L. transv. ^-^ 



The height of the body is from one-fifth to one-seventh of the 

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

 Snout blunt, with the upper profile descending in a strong curve, as 

 long as the eye. Mouth small, inferior. The diameter of the eye 

 is rather more than one-fourth of the length of the head ; suborbital 

 ring very narrow ; interorbital space flat, its width being more than 

 the diameter of the eye, and two-fifths of the length of the head. 

 The origin of the dorsal fin is a little behind that of the ventrals, 

 and midway between the end of the snout and the root of the caudal 

 fin ; upper margin of the dorsal fin rather convex ; ventral fin ex- 

 tending to the vent ; caudal fin forked. There are two and a half 

 longitudinal series of scales between the lateral line and the ventral 

 fin ; a faint blackish longitudinal stripe along the lateral line. 



Canada ; United States. 



a. Three and a half inches long ; snout tubercular. Montreal. 



Purchased of Mr. Wright. 



b. Several specimens. Kenhawa River. Purchased of Mr. Cope. 



c. Adult ; snout tubercular ; tail deformed. Kenhawa E,iver. Pur- 



chased of Mr. Cope as Hyborhynchus superciliosus. 



37. CAMPOSTOMA *. 



Campostoma, Agass. Amer. Journ. »S'c. ^- Arts, 1855, xix. p. 218; Cope, 

 Journ. Ac. Nat. Sc. Philad. xiii. pp. 356, 393. 



Scales of moderate or small size ; lateral line running along the 

 middle of the tail. Dorsal fin short, without spinous ray, com- 

 mencing nearly opposite the ventrals ; anal fin short. Mouth infe- 

 rior, narrow ; intermaxillaries slightly protractile. Lower jaw with 

 a sharp edge ; barbels none ; gill-rakers extremely short and fine ; 

 pseudobranchiiB. The attachment of the gill - membrane to the 

 isthmus takes place behind the prajoperculum. Air-bladder enve- 

 loped by the numerous convolutions of the intestinal canal, which is 

 long (Mesnet/sti, Cope). Pharyngeal teeth 4 — 4, compressed. 



United States. 



* 1. Campostoma formosuluni, Girard, Proc. Ac. Nat. Sc. Thilad. 1856, 

 p. 170 ; or V. S. Sf Mex. Bound. Ichthyol. p. 41, pi. 25. figs. 5-8. — Eio 

 Sabinal, Texas. 



2. nasiitum, Girard, II. cc. figs. 9-12. — New Leon, Mexico. 



3. Hybognathus placitus, Girard, Proc. Ac. Nat. Sc. I^hihuJ. 1856, p. 182; 



or U. S. cf" Pac. S. E. Exped. Fish. p. 236. — Campostoma placitum, 

 Cope, Proc. Ac. Naf. Sc. Philad. 1864, p. 284 (name only). — Arkansas. 



4. Campostoma mormyrus. Cope. I.e. — Bruce, Macomb County. 



6. gobioninum. Cope, I. c. — Bruce, Macomb County and Grosse Isle. 



6. hippops, Cope, I. c. — Platte Eiver. 



