486 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
The scales are large, in but 44 series from the origin of the second 
dorsal to but excluding the lateral line series; an additional series 
is inserted shortly behind the origin of the second dorsal. The 5 
to 7 widely divergent carinae on each scale of the body are armed 
with about 6 very strong, broad spinules, imbricate, and increasing 
in strength posteriorly, the last one often projecting a little beyond 
the margin of its scale; the spinules of the median series are often 
much larger than those on the lateral carinae.. The scales on the 
spinous ridges of the head are greatly strengthened. The dorso- 
terminal and ventroterminal plates are armed by 3 to 5 divergent 
carinae, and are scarcely produced beyond the lateral contour of the 
head. There are 7 to 9 scales along the ethmoid portion of the 
infraorbital ridge on each side; the 9 to 11 scales on the preorbital 
portion of the ridge are largest below the front margin of the orbit, 
Fic. 16.—CorLORHYNCHUS PLATORHYNCHUS. Typr. AFTER RADCLIFFE. 
and bear spinules mostly confined to their lower margins and to a 
single vertical series; the scales of the suborbital and preopercular 
portions of the ridge—that is, behind the vertical through the mid- 
dle of the eye—are arranged in two series; the distance between 
the end of the infraorbital ridge and the preopercular margin is 
contained 4 (3.5 to 5) times in the postorbital length. The scales 
between the orbit and the infraorbital ridge are small; those from 
the nasal fossa to below the middle of eye are irregular in position 
and somewhat strengthened, while those below the posterior half 
of the orbit, and backward to the preopercular ridge, are regularly 
arranged, and bear mostly a single spinous ridge directed backward 
and downward. <A series of 10 to 12 scales covers the median su- 
perior rostral ridge, extending backward to between the verticals 
from the front of orbit and the front of pupil; each of these quadrate 
scales is armed by 8 to 7 spinous carinae radiating outward and 
backward from the middle of its front margin. 
The occipital ridges are covered by modified scales in the form of 
elongate tubercles bearing one or two keels, which are armed by 
