28 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
List of specimens. 
Catalogue num- j 
ber. 
Number of spe¬ 
cimens. 
Sex and age. 
Locality. 
When collected. 
462 
4 
Yg~ 
Camanclie spring, Texas_ 
1853 
463 
4 
Adt.. 
Sans Bois creek, Canad_ 
1853 
464 
6 
_ _do. _ 
Trib. of Gypsum creek, Canad_ 
1853 
465 
6 
Yg- 
Rio Seco, Tex. 
1853 
466 
3 
-.do.. 
Rio Medina, Tex__ 
1853 
407 
2 
1853 
457 
2 
Adt.. 
Rio Cibolo, Tex.-. 
1851 
458 
1 
-_do_ _ 
Elm creek, Tex- 
1851 
459 
5 
Yg-- 
Rio Salado, Tex.. 
1851 
460 
6 
-.do.. 
Live Oak creek, Tex- 
1854 
461 
5 
-.do.. 
San Pedro creek, Tex_ 
1854 
468 
12 
--do.- 
Delaware creek--- 
1856 
409 
12 
1856 
470 
12 
1856 
Whence obtained. 
Original number. 
Nature of 
specimens. 
Collected by— 
Lt. Parke_ 
Lt. Whipple_ 
1 
Alcoholic 
-do. 
Dr. A. L. Heermann 
H. Mollhausen_ 
_do_ 
19 
18 
-do-- 
Dr. Kennedy_ 
_do..... 
Col. Graham__ 
---.do_ 
John H. Clark_ 
_do_-_ 
Maj. Emory_ 
64 
59 
-do. 
_do_ 
Dr. Kennedy_ 
Capt. John Pope_ 
_do. 
Capt. John Pope... 
_do_ _ 
_do_ 
1 . POMOTIS BREVICEPS, B. & G. 
The Blunt headed Snnlish. 
Spec. Char.— Body sub-elliptical. Head moderate ; snout bluntly rounded ; mouth small ; posterior extremity of maxillary 
extending midway between the anterior rim of the orbit and the pupil. Eye small. Edge of preopercle finely crenated. 
Opercular flap very 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. 
S YN .— Pomotis breviceps, B. & G., Prod. Acad. Nat. Sc. Philad. VI, 1853, 309 ; Sf, 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. The spinous portion of the dorsal fin is of medium height, 
superiorly 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. Y: Y; 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 
