41 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY—GENERAL REPORT. 
Br. VI: YI; D XIX, 23 ; A 21; C. 4, 1, 1, 8, 1, 6 ; V I, 5 ; P 19. 
The scales are more uniform than in G. constellatus; they are much smaller upon the opercular 
apparatus and cheeks than in the latter species. The interopercle, snout, branchiostegal appa- 
tus, are smooth* The type of scales is the same as in the other species of this genus : ciliated 
posteriorly, and furrowed upon the anterior section only. Those constituting the lateral lines 
having no cilise; and, besides, distinguishable by their pyriform outline, the attenuated ex¬ 
tremity being the posterior one. The ordinary scales are much longer than deep. There are 
five lateral lines, as in the preceding species; the uppermost i3 not quite so near the dorsal 
line, and hence closer to the second. No marked differences are observed in their direction, 
origin, and termination, except that in the fifth, the point of divergence begins at a little distance 
behind the origin of the ventrals. The diverging curve is elongated. Small scales may he 
seen upon the base of the caudal, dorsal, and pectoral fins. 
The ground color is dark brown above ; lighter beneath. Numerous vermillion spots, mar¬ 
gined with black, and varying in size, are distributed without system all over the body. The 
dorsals and caudal fin are blackish brown, unicolor in the adult, blotched in the young. 
The anal is bluish black, with a series of large vermillion spots. The ventrals are similarly 
bluish black, hut the spots are smaller. The base of the pectorals is brown, with three black 
crescents; exteriorly yellowish. 
References to the figures. —Plate XX, fig. 1, represents Chiropsis pictus, somewhat reduced. 
Fig. 2 is a scale from the abdominal region. Fig. 3 a scale from the middle lateral line. Fig. 4 
a scale from the dorsal region. 
List of specimens. 
Catalogue number. 
Corresponding num¬ 
ber of— 
No. of specimens. 
Sex and age. 
Locality. 
When collected. 
Whence obtained. 
Original number. 
Nature of specimens. 
Collected by— 
266 
2 
Adult 
Rftn TYfinciRco. Oal_ 
Lieut. Williamson .. 
Alcoholic. 
Dr. Heermann.. 
267 
1 
..do.. 
.do. 
. 
.do. 
. 
_do. 
Dr. Newberry. . 
268 
3 
..do.. 
Humboldt Bay, Cal-... 
Lieut. Trowbridge .. 
....do . .. 
Lt. Trowbridge - 
3. CHIROPSIS GUTTATUS, Grd. 
Plate XX, Figs. 5-8. 
Spec. Chau. —Dorsal fins contiguous. Caudal fin posteriorly sub-concave. Ground color olivaceous ; upper regions with 
crowded small black spots; fins blackish brown. 
Svn .—Chirus guttaius, Gkd. Proc. Acad. Nat. Sc. Philad. VII, 1854, 132. 
The body in its general outline is intermediate in form between C. constellatus and O. pictus, 
though more like the latter in its general bearing, the dorsal and ventral outlines being more 
arched. The greatest depth is somewhat greater than the length of the head and contained about 
four times in the total length. The head is proportionally larger than in the two foregoing 
species. The caudal fin, on the other hand, enters nearly seven times and a half in the total 
length, as is the case in C. pictus. The eye is larger than in G. pictus , since its diameter is 
contained but four times in the length of the side of the head. The supraocular flaps are 
