28 



U. S. p. R. R. EXP. AND SURVEYS ZOOLOGY — GENERAL REPORT. 



List of specimens. 



o a 

 II 



a " 



462 

 463 

 464 

 465 

 466 

 467 

 457 

 458 

 459 

 460 

 461 

 468 

 469 

 470 



a 

 n 



SQ 



Yg- 

 Adt. 

 -do. 



Yg- 

 -do. 

 -do. 



Adt. 

 ..do. 



Yg- 

 ..do. 

 ..do. 

 ..do. 

 ..do. 

 ..do. 



Locality. 



Camanche spring, Texas 



Sans Bois creek, Canad 



Trib. of Gypsum creeic, Canad. 



Eio Seco, Tex 



Eio Medina, Tex 



.do. 



Rio Cibolo, Tex 



Elm creek, Tex 



Rio Salado, Tex 



Live Oak creek, Tex . 

 San Pedro creek, Tex. 



Delaware creek 



do 



do 



Wlience obtained. 



& 



1853 



1853 

 1853 

 1853 

 1853 

 1853 

 1851 

 1851 

 1851 

 1854 

 1854 

 1856 

 1856 

 1856 



Lt. Parke 



Lt. Whipple . 

 , do 



.do. 

 .do. 



.do. 



Col. Graham. 

 do 



.do. 



Maj. Emory 



do 



Capt. John Pope. 



do. 



do 



Nature of 

 specimens. 



Alcoholic 



....do 



....do.... 



.do...... 



.do 



.do. 



.do. 



.do. 



-do. 



.do. 

 .do. 



-do. 

 .do. 

 .do. 



Collected by- 



Dr. A. L. Ecermann 



H. Mollhausen 



do 



Dr. Kennerly . 

 do , 



.do. 



John H. Clark .. 

 do 



.do. 



Dr. Kennerly 



do 



Capt. John Pope. 



do 



do 



1. POMOTIS BREVICEPS, B. & G. 



The Blunt headed Snnfish. 



Spec Char. Body sub-elliptical. Head moderate ; snout bluntly rounded ; mouth small ; posteiior extremity of maxillary 



extending midway between the anterior rim of the orbit and the pupil. Eye small. Edge of preopercle finely crenated. 

 Opercular flap voiy large. Spinous portion of dorsal fin of medium height ; its origin situated posteriorly to the upper edge of 

 the base of the pectorals. Caudal posteriorly emarginated. Reddish brown ; a black spot at the posterior margin of the 

 dorsal fin. 



Sis.—Pomotis breviceps, B. & G., Prod. Acad. Nat. Sc. Philad. VI, 1853, 309 ; Sr, in Marcy's Expl Red Riv. La. 1853, 246, 

 PI. xiii. 



This species, though very characteristic, resembles somewhat the normal type of P. fallax. 

 Its body is sub-elliptical ; its head, of moderate development, terminated by a bluntly rounded 

 snout, and constituting the fourth of the total length. The mouth is rather small, and the 

 posterior extremity of the maxillary extends midway between the anterior rim of the orbit and 

 the pupil. The eye is small also. As to the preopercular edge, it is finely crenated. The 

 opercular flap is very large. Tlie spinous portion of the dorsal fin is of medium height, 

 Buporiorly convex, its origin being placed posteriorly to the upper edge of the base of the 

 pectoral fins. The anal is well developed, especially its soft portion ; the spines themselves are 

 stoutish, but rather short. The ventrals are of moderate development ; their extremities over- 

 lap the vent, but do not extend as far as the anterior margin of the anal. The pectorals are of 

 moderate development also, roundish ; their extremities not extending so far back as those of 

 the ventrals. 



Br. V : V ; D X, 11 ; A III, 9 ; C 4, 1, 8, 7, 1, 3 ; V I, 5 ; P 14. 



The scales are well developed,much deeper than long, anteriorly sub-truncated, rounded upon 

 the remaining edges, and conspicuously pectinated posteriorly. Five series of them are often 

 observed upon the cheeks, and of about one-third smaller than those covering the opercle. The 



