396 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
shape of the black spot on the upper part of the side of the body. In all descriptions and figures of 
C. unimaculaius this mark is represented as an ocellated spot having a definite circular outline without 
any ventral tapering prolongation. On all of the Hawaiian specimens (preserved in formalin and 
alcohol) examined by me the ventral prolongation of the spot is distinctly marked and could not 
possibly be overlooked. 
(Scpijv, a wedge; 6iti\o s, spot.) 
Numerous specimens secured by me at Honolulu. Type No. 49705, U. S. N. M. 
The following are the measurements and the numbers of fin rays and scales of four specimens: 
Chaetodon sphenospilus. 
No.l. 
No. 2. 
No. 3. 
No. 4. 
Chaetodon sphenospilus. 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
Length in millimeters.. 
96 
92 
86 
77 
Dorsal spines 
XIII 
XIII 
XIII 
XIII 
Head 
.28 
.29 
.32 
. 30 
Second dorsal rays 
22 
23 
23 
23 
Depth 
.62 
.71 
.70 
.73 
Second anal ravs 
19 
19 
19 
19 
Eye 
. 09 
.09 
.10 
.11 
Scales (longitudinal) . . . 
54 
5(1 
58 
50 
Interorbital 
.11 
.10 
.11 
.11 
Scales (transverse) 
7-23 
7-21 
7-21 
7-20 
Snout 
.10 
.10 
.12 
.11 
8. Chxtodon sphenospilus Jenkins, new species. Type. 
Family OSTRACIID793. 
Ostracion camurum Jenkins, new species. Fig. 9. 
Body four-sided, back rounded, interorbital fiat, profile before eye prominently convex. Head 
3.75 in length of body; depth 3 in length. Interorbital space at front of eyes equal to head, wider 
posteriorly. Eye 2.66 in middle of interorbital, 2 in snout. Dorsal profile of snout very steep; forming 
a reentrant angle just above tip of snout (this angle not very conspicuous in the smaller specimens). 
Sides of body concave. Greatest dorsal width 3 in length, equal to depth; greatest ventral width 2.6 
in length. Carapace forming wide bridge back of dorsal fin; length of part back of dorsal fin 2 in 
