120 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



caudal. Caudal deeply forked, its lobes slender, the upper the longer. 

 Scales 7-37-5 ; D. 2G or 27. Chesapeake Bay to Mississippi Valley ; 

 generally abundant. 



(? Catostomus cyprinus Le Sueur, Journ. Acad. Nat. Sci. Phila. 1817, 91 ; Giiuther, vii, 

 12 : Cafostomns velifer Rafinesque, Ichtli. Oh. 18'20, 56 : Carinodes velifer Cope, Proc. 

 Amer. Phil. Soc. Piiila. 1870, 482 : Carpiodes velifer Jordan, 1. c. 193: Carpiodes cutisan- 

 ■serinus Coiie, Proc. Amer. Phil. Soc. Phila. 1870, 481 : Carpiodes cullsanserinus Jordan, 

 1. c. 190 : Carpiodes svlene Cope, Proc. Amer. Phil. Soc. Phila. 1870, 41.) 



121. C. dfllforcsaBS Cope, 



Muzzle exceedingly blunt, so that the anterior edge of the mandible is 

 in line with the anterior rim of the orbit, and the maxillary reaches to 

 the anterior edge of the pui^il. Anterior suborbital deeper than long. 

 Head 4^ in length. Eye quite large, 31-4 in head. Body arched, the 

 deptli somewhat less than half the length. First ray of dorsal nearer 

 muzzle than base of caudal. Scales G-35-4 ; D. 24 j A. 8 ; Y. 9. Ohio 

 Valley ; not common. Perhaps a deformity of the preceding. 



(Cope, Proc. Amer. Phil. Soc. Phila. 1870, 480; Jordan, 1. c. 195.) 



62.— CYCLEPTfJS Rafiuesaue. 



Black Horse. * 



(Rafinesque, Journ. Phys. Chim. Hist. Nat. Paris, 1819, 421 : type Cycleptus nigres- 

 cens Raf. = Catostomus elongatus Le Sueur.) 



Head very small, short and slender, its length contained 6-7 times in 

 that of the body ; its upper surface rounded. Eye small, behind the 

 middle of the head ; not veiy high up, its length 6-8 in that of the head. 

 Suborbital bones small and narrow. Eontanelle entirely obliterated by 

 the union of the i^arietal bones. Mouth small, entirely inferior, over- 

 lapped by the projecting snout; the upper lip thick, i^endent, covered 

 with 3-5 rows of tubercles, the outer quite large, the inner small ; lower 

 lip moderate, formed somewhat as in Catostomus, but less full, incised 

 behind. Jaws with rudimentary cartilaginous sheath. Muciferous sys- 

 tem not greatly developed. Opercular apparatus not greatly devel- 

 oped; the operculum smooth and narrow. Isthmus moderate. Gill- 

 rakers moderately long, soft. Pharyngeal bones strong ; the teeth stout, 

 increasing in size downwards, rather wide apart. Body elongate, mod- 

 erately compressed, not much elevated; the caudal peduncle long ; the 

 greatest depth contained 4-6 times in length. Scales moderate, about 

 equal over the body, not closely imbricated, with wide, exposed sur- 

 faces, the number in the lateral line from 55-60, and about 17 in a trans- 

 verse series from dorsal to ventrals. Edges of scales crenate. Later 

 line vv'ell developed, nearly straight. Fins rather large, dorsal fin be 



a,a. 



