150 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



'!. Proc. Arad. Xat. SVi. Phila. l^.'f,, 1?G, from the Rio Grande, may be a distinct 

 tee I'spi-eiiiien"! li.-t'.iri- us have a -lenderer head and rather more compressed and 

 elevated l><>dy than is iiMial in C. atwmalum): Campoxtninu dnbium Giiuthcr, vii, Id3; 

 su,Amer.Jouni.8ci. Arts, 1855,218; Jordan, Man. \\it. ed. x.', 'it7.) 



ft Teeth 1, 4-4, 0. 



172. C. prolixum (Storer) Jordan & Gilbert. 



Slenderer than C. anomaUon. Head rather shorter and narrower. 

 Scales larger and less crowded, and the coloration more uniform and 

 paler, or more silvery. Head 4f ; depth 4. D. 8 ; A. 7 ; seales 7-4! (-6 ; 

 teeth 1, 4-4, 0. Tennessee, Georgia, and Alabama; abundant. Very 

 similar to the preceding, but probably worthy of specific distinction on 

 account of the difference in dentition, constant in all specimens exam- 

 ined. 



(Leuciscus prolixus Storer, Proc. Bost. Soc. Nat. Hist. July, 1845: Campostoma anoma- 

 Itiin var. prolijriiiit Jordan, Auii. Lye. Nat. Hist. N. Y. 1876, 326.) 



*** Scales laryt-r, about 4~> in the course of the lateral line ; teeth 4-4 (?). 



173. C. foronosuluni Grd. 



Ilead short and blunt, with broad, projecting- snout. Head 4; depth 

 4.}. D. 8; A. 7; Lat. 1. 45. Grayish above, whitish below; sides more 

 or less marinorate ; a black patch at the base of the caudal and on the 

 dorsal. San Antonio lliver, Texas. (Girard.) 



(Grd. Proc. Acad. Nat. Sci. Phila. 1856, 176.) 



72. ACROCHBLUS Agassi/.. 



Hard-mouths. 



(.UrofliitluH A.na>si/, Amcr. Jouru. Sci. Arts, 1855, 211: type Acroclicilus alutaccus 

 A- issi/. & Pickering.) 



I'.ody elongate, little compressed. Both jaws with a large, straight, 

 horny plate, sharp externally and very eonspieiious. rpnerjawprotrae- 

 tile. No barbel. Teeth 4-5, stout, hooked, with broad masticatory sur- 

 laer. Intestinal canal elongate. Peritoneum black. I'seiidoliranchia' 

 ].ic>ent. Scales small, loosely imbricated. Lateral line present. Dor- 

 lin slightly behind ventrals. Anal basis moderate. Caudal lin 

 broad, its i ndimentary rays recurrent on the caudal peduncle. Size 

 rather lar-c. ('/'//',:, sharp; ^^ :/.?, lip.) 



171. A. aliitaci'iis A^ass. & Pifk. Hani-month. 



(ieneral Ibrm and appearance of the species of (.iila, but the head not 

 depressed, and more blunt forward. I'.ody elongate, not much com- 

 pressed, its sides more so than the caudal peduncle; the greatest depth, 

 over the ventrals, I in length. Caudal peduncle very long and slender, 



