150 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 



Grd. Proc. Acad. Nat. Sci. Phila. 1S5G, 176, from tlie Rio Grande, may be a distinct 

 species (specimens before ns bave a slenderer bead and ratber more compressed and 

 elevated body tbau is usual in C. anomaliin) : Campostoma dubium Giintber, vii, lb3 ; 

 Agassiz, Amer. Jouru. Sci. Arts, 1855, 218 ; Jordan, Man. Vert. ed. 2, 287.) 



trreetb 1, 4-4, 0. 



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



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

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

 paler, or more silvery. Head 4| ; depth 4J. D. 8 ; A. 7 ; scales 7-49-C ; 

 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 nil specimens exam- 

 ined. 



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

 lum var. prolixum Jordan, Ann. Lye. Nat. Hist. N. Y. 1876, 326.) 



*** Scales larger, about 45 in tbe course of tbe lateral line ; teetb 4-4 (?). 



173. C. foranosulum Grd. 



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

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

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

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



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



72.— ACROCHfiLUS Agassiz. 

 Sard-mouths. 



{Acroclieilus Agassiz, Amer. Journ. Sci. Arts, 1855, 211 : tyjie Acroclwilus alutaceus 

 Agassiz & Pickering.) 



Body elongate, little compressed. Both jaws with a large, straight, 

 horny plate, sharp externally and very conspicuous. Upper jaw protrac- 

 tile. Ko barbel. Teeth 4-5, stout, hooted, with broad masticatory sur- 

 face. Intestinal canal elongate. Peritoneum black. Pseudobrauchiaj 

 l^resent. Scales small, loosely imbricated. Lateral line present. Dor- 

 sal fin slightly behind ventrals. Anal basis moderate. Caudal fin 

 broad, its rudimentary rays recurrent on the caudal peduncle. Size 

 rather large, {a/.pog, sharp; yj't^o-, lip.) 



174. A. alaitaceus Agass. & Pick. — Eard-mouth. 



General form and appearance of the species of Gila, but the head not 

 depressed, and more blunt forward. Body elongate, not much com- 

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

 over the ventrals, 4 in length. Caudal peduncle very long and slender, 



