456 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
ones usually with several divergent ridges, the posterior ones with 
but the single median keel persistent in the larger specimens. The 
median occipital scute is armed by a rather strong median keel, and 
from one (as in the type) to three lateral divergent series. A simi- 
lar but smaller scute, located near the origin of the lateral line, is less 
strongly developed than in C. maculatus. 'The area between the 
occipital and postorbital ridges is largely covered by three longitu- 
dinal series of scales, similar to those on the body; those in the median 
series, although the largest, are not so much enlarged as in C’. macu- 
latus. As in C. maculatus, five series of scales occupy the area be- 
tween the occipital ridges; the scales of the median series are the 
largest, and bear seven or fewer carinae (in the type). The scales 
bounding the superior rostral ridge form an area similar to that of 
C. maculatus, but are in other respects quite dissimilar: they are 
arranged in a single series on each side; they are of subquadrate out- 
line, and they are armed in a peculiar and diagnostic fashion: 
each scale is sharply divided into two regions by that diagonal which 
extends from the anterolateral angle across the scale to the inner 
posterior angle; the posterolateral triangular area, thus outlined, is 
armed by several (four to six in type) parallel or subparallel spinous 
‘arinae, while the inner-anterior triangular area bears but one or 
two spinous ridges coursing inward and backward. The area within 
the anterolateral margins of the snout, mostly scaleless in C. macul- 
atus, is largely covered with prickles in C. velifer. The under side of 
the head, including the branchiostegal membrane, and also the nasal 
fossa, are wholly naked. 
The first dorsal spine is short but sharp, the second is long and 
filamentous, with a base grooved on its three sides; the anterior edge 
of the spine is rounded, and is constantly wholly spineless. The base 
of the first dorsal is a little shorter than the interval between the 
dorsals. The second dorsal is not so rudimentary anteriorly as 1t 
often is, the first ray being contained 4.5 times in the orbit. The anal 
fin is inserted a little in advance of the vertical from the origin of 
the second dorsal. The second ventral ray in the type reaches to 
between the anus and the anal fin. 
Table of measurements of length of fins* in the males, young males, and females. 
Type. Paratypes. 
Nature of specimen. aae waar Ge ae 
Male. | Large males. | Young males. Females. 
= eri te ED 
Lengthiof heads mms 25.4205 os sce one oaeee 53.5 42.5 to55 |; 40 and 42 41 to 63 
Second )dorsal:spiney sos ae sees ee ee ee . 805 -80to 1.05 1.08 1.15to 1.46 
TOIT GOrSalray < erle Gene de ese = was es eee ee aE eee 1.08 to 1.16 1. 23 1.36 to 1.61 
Pectoralfims oie as ah RR eee eee cee 1.10 1.10 to 1.39 1.55 to 1.60 1.58 to 2.46 
Outer*ventral rayo.20 Seo seeee whee ae REP ae 1.38 1.24to 1.64 1.55to 1.74 1.71 to 2.22 
Second: ventral ray. .222 oo e ae nae eens 2.45 2.25to 2.68 2.70 to 2.85 2.72 to 3.60 
1 xpressed in the number of times each ray or fin is contained in the head. The table 
is Summarized from measurements on 30 specimens. 
