20 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
The color is pale reddish brown above, lighter beneath. The fins are greyish olive, the 
dorsal being provided with a black patch upon its posterior basal margin. The opercular 
patch is large, margined posteriorly with a white membranous flap. 
References to the figures. —Plate VI, fig. 1, represents Bryttus albulus, size of life. Fig. 2, a 
scale from the dorsal region. Fig. 3, a scale from the lateral line. Fig. 4, a scale from the 
abdominal region. 
Catalogue number. 
Corresponding No. 
of 
No. of specimens. 
Sex and age. 
# 
Locality. 
When collected. 
Whence obtained. 
Original number. 
Nature of spe¬ 
cimens. 
Collected by— 
421 
4 
Ad’t. 
Rio Blanco, Texas_ 
1853 
Lieut. A. W. Whipple. 
20 
Alcoholic_ 
Dr. Kennerly. 
2. BRYTTUS SIGNIFER, Grd. 
Plate YII, Figs. 5—8. 
Spec. Char. —Body contracted and deep. Nape convex, and snout sub-conical. Posterior extremity of maxillary ex¬ 
tending to a vertical line drawn in advance of the pupil. Insertion of ventrals situated posteriorly to the base of pectorals 
and the origin of dorsal, their tips overlapping the vent. Scales moderate. Reddish brown, lighter beneath than above, 
dorsal and anal fins provided with a black patch. 
Stn .—Bryttus signifer, Grd. in Proc. Acad. Nat Sc. Philad. November, 1857. 
This species may easily he distinguished from the preceding one by its mouth being more 
deeply cleft, and its caudal fin more emarginated. The outline of the spinous portion of the 
dorsal fin is more arched and the scales somewhat smaller, though, as usual, deeper than long. 
The scales on the cheeks are smaller than on the opercle, although the average difference in 
size between the two is not so great as in B. albulus. The posterior extremities of the dorsal 
and anal fins are nearly even, hut do not extend to the insertion of the caudal. 
Br. Y: Y; DX, 11; A III, 10; C 3, 1, 8, 7, 1, 2 ; VI, 5; P 15. 
Color reddish brown, lighter beneath. The fins being greyish, the dorsal, and occasionally 
the anal, are provided with a black patch upon their basal posterior margin. The opercular 
black patch is margined with a white membranous flap. 
References to the figures. —Plate VII, fig. 5, represents Bryttus signifer , size of life. Fig. 6 is a 
dorsal scale. Fig. 7, a scale from the lateral line. Fig. 8, a scale from the abdominal region. 
List of specimens. 
Catalogue number. 
No. of specimens. 
Locality. 
When collected. 
Whence obtained. 
Original number. 
Nature of spe- 
mens. 
Collected by— 
422 
6 
Rio Medina, Texas__ 
1853... 
Lieut. A. W. Whipple- 
18 
Alcoholic. - - - 
Dr. Kennerly ... 
