150 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
Gi'fl. Proc. Acad. Nat. Sci. Phila. 185G, 176, from tlie Rio Graude, may be a distiiici 
Bpecies (specimens before ns have a slenderer bead and rather more compressed am 
elevated body than is usual in C. anomaluni ) ; Carnpostoma diibiam Giinther, vii, IBS 
Agassiz, Amer. Journ. Sci. Arts, 1855, 218; Jordan, Man. Vert. ed. 2, 287.) " 
+1 Teeth 1, 4-4, 0. 
172, C. prollxuEii (Storer) Jordan & Gilbert. 
Slenderer than C. anomalum. Head rather shorter and narrower 
Scales larger and less crowded, and the coloration more uniform ant 
l^aler, or more silvery. Head 4f ; depth 4J. H. 8 ; A. 7 ; scales 7-49-6 
teeth 1, 4-4, 0. Tennessee, Georgia, and Alabama; abundant. Ver^ 
similar to the preceding, but probably worthy of specific distinction oi 
account of the difference in dentition, constant in all specimens exam 
iued. 
(Leucisciis 2 )rolixus Storer, Proc. Bost. Soc. Nat. Hist. July, 1845: Camposloma anoma 
Turn xar. pirolixum Jordan, Ann. Lyc. Nat. Hist. N. Y. 1876, 326.) 
*** Scales larger, about 45 in the course of the lateral line; teeth 4-4 (?). 
lYS. C. formosuisim Grd. 
Head short and blunt, with broad, projecting snout. Head 4; deptt 
4 J. D. 8 ; A. 7 ; Lat. 1. 45. Grayish above, whitish below ; sides mori 
or less marmorate ; a black patch at the base of the caudal and on tht 
dorsal. San Antonio Eiver, Texas. {Girard.) 
(Grd. Proc. Acad. Nat. Sci. Phila. 1856, 176.) 
■ya.— ACie®CIBILirS Agassiz. 
Hard-mouths. 
{Acrocheilus Agassiz, Amer. Journ. Sci. Arts, 1855, 211 : tyjie Acrochcilus alutaceu. 
Agassiz & Pickering.) 
Body elongate, little comiiressed. Both jaws with a large, straight 
horny plate, sharp externally and very conspicuous. Upper jaw protrac 
tile. No barbel. Teeth 4-5, stout, hooked, with broad masticatory sur 
face. Intestinal canal elongate. Peritoneum black. Pseudobranchia 
present. Scales small, loosely imbricated. Lateral line present. Dor 
sal fill slightly behind veutrals. Anal basis moderate. Caudal fii 
broad, its rudimentary rays recurrent on the caudal xiediincle. Siz( 
rather large, {d/.poi;^ sharj); /jlXu-, liji.) 
17 1. A. alaataceiis Agass. & Pick. — Rarcl-moulh. • 
General form and axijiearauce of the species of Gila.) but the head nol 
dexiressed, 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 jieduucle very long and slender. 
