28 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
List of specimens. 
Catalogue num- 1 
ber. 
jN umber of spe¬ 
cimens. 
Sex and age. 
Locality. 
When collected. 
Whence obtained. 
Original number. 
Nature of 
specimens. 
Collected by— 
462 
4 
Ys 
Camanche spring, Texas_ 
1853 
Lt. Parke _ _ 
Alcoholic 
Dr. A. L. Heermann 
463 
4 
-- 
Adt.. 
Sans Bois creek, Canad_ 
1853 
Lt. Whipple .. . 
1 
_do. 
H. Mollhausen.... 
464 
6 
..do.. 
Trib. of Gypsum creek, Canad... 
1853 
.do. 
465 
6 
Yg .. 
Rio Seco, Tex...___ 
1853 
.do.. 
19 
----do_ 
Dr. TCennerly 
466 
3 
..do.. 
Rio Medina, Tex___ 
1853 
18 
467 
2 
..do. 
1853 
_do__ 
457 
2 
Adt.. 
Rio Cibolo, Tex_ 
1851 
Col. Graham_ 
John H. Clark .... 
458 
1 
- .do 
Elm creek, Tex_,___ 
1851 
459 
5 
Yg .. 
Rio Salado, Tex_ 
1851 
_do_-_ 
_do. 
......do. 
460 
6 
do 
Dive Oak ereek ; Tex_ 
1854 
Maj. Emory 
64 
--.-do...... 
Dr Tv prmerly 
461 
5 
-.do-. 
San Pedro creek, Tex._ 
1854 
.do. 
59 
_do_ 
do_ 
468 
12 
_ _do 
Delaware creek-- -- -- -- -- -- -- -- 
1856 
Capt. John Pope_ 
_do 
Capt. John Pope... 
469 
12 
1856 
_do_ _ 
do 
470 
12 
_do. 
1856 
.do. 
.do_ 
7. POMOTIS BREYICEPS, B. & G. 
The Blunt headed Sunfish. 
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. 
Syn.— Pomotis breviceps, B. & G., Prod. Acad. Nat. Sc. Philad. VI, 1853, 309 ; &r, 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, hut rather short. The ventrals are of moderate development; their extremities over¬ 
lap the vent, hut 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 hack as those of 
the ventrals. 
Br. Y: Y ; D X, 11; A III, 9 ; C 4, 1, 8, 7, 1, 3 ; Y 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 
