104 U. S. P. E. E. EXP. AND SUEYEYS-ZOOLOGY—GENEEAL EEPOET. 
and dichotomised rays, and a rudimentary, undivided one upon their external edge. The pec¬ 
torals are well developed, posteriorly falciform, and terminating into a point. 
Br. YI: VI; D VII, 13 ; A I, 27 ; C 5, 1, 8, 7, 1, 7 ; V I, 6 ; P 15. 
The scales are large, constituting hut thirteen longitudinal series upon the line of greatest 
depth of the body. Longer than deep on the dorsal region, and deeper than long on the 
abdominal region, they are rounded off upon their posterior margin, and truncated upon their 
anterior margin. Radiating grooves may be seen upon the posterior section of the scale only. 
The cheeks, operculatur apparatus, and the upper surface of the head, are covered with large 
and imbricated scales, similar to the scales of the body, except that their outline is subjected to 
infinite variations. 
The dorsal region above the silver hand is greyish brown, as also the upper surface of the 
head ; the silver hand is margined with bluish black. The flanks, sides o head, and belly are 
light brown in the young and silvery in the adult. The fins are olivaceous and unicolor. 
References to the figures .—Plate XXII c, fig. 1, represents, size of life, Atherincpsis califor- 
niensis, from San Francisco. Fig. 2, an outline of the fish seen from above. Fig. 3, an outline 
of the head from beneath. Fig. 4, a section of the body taken across its middle. Fig. 5 is a 
scale from the dorsal region. Fig. 6, a scale from the abdominal region. 
List of specimens. 
o 
P 
5 
Q 
P 
fcfi 
o 
C 
No. of specimens. 
Sex and age. 
Locality. 
When collected. 
Whence obtained. 
Nature of specimens. 
Collected by— 
351 
5 
Adult... 
San Francisco, California — 
1853 
Lieut. R. S. Williamson_ 
Alcoholic— 
Dr. Heermann 
352 
2 
_do_ 
1853 
Dr. Newberry_ 
353 
1 
.do. 
1853 
Lieut. A. W. Whipple. 
Dr. Kennerly_ 
354 
6 
Presidio, California __ 
1853 
Lieut. W. P. Trowbridge_ 
_do. 
Lieut. Trowbridge 
355 
1 
San Diego, California------- 
1854 
Major W. Emory__ 
_ _ _do 
A. Schott. 
356 
2 
1853 
Lieut. W. P. Trowbridge_ 
_do_ 
A. Cassidy_ 
357 
5 
do 
1853 
358 
2 
Adult.... 
Tomales bay, California - _ - - 
1856 
F. Samnpis 
do 
E. Samuels_ 
359 
@ 
do __ 
1856 
