504 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
is very broad, and by maintaining its width forward more strikingly 
than usually, renders the sides of the snout much more convex dis- 
tally than in other species with a similarly long snout; its preocular 
length is contained 2.25 times in head; its preoral length, 2.6 times; 
its width at base, 2.75 times in head, 1.2 times in preocular length; 
the width of snout at the end of the ethmoid region of the infra- 
orbital ridge is equal to the length of snout anterior to that point. 
The ridges of the head are prominent; the occipital ridges are but 
little divergent forward and backward; the least distance between 
them is contained 1.2 times in the distance between either their an- 
terior or posterior ends, and is just half the least interorbital width. 
The preopercular margin is denticulate; the subopercle is produced 
backward into a sharply pointed flap. The orbit is smaller than 
usual in this group, its length being contained 4.25 times in head, 1.9 
times in snout, 1.35 times in postorbital. Least interorbital width, 
Fig. 25.—CoELORHYNCHUS WEBERI. TYPE. AFTER RADCLIFFE (‘‘ COELORHYNCHUS 
COMMUTABILIS, FORM ETA’’). 
1.45 in postorbital; least suborbital width, 2.35. The upper jaw ex- 
tends from below the middle of anterior nostril backward to below 
the hind margin of orbit; its length is contained 4.05 times in the 
lead; barbel, 4.2 in postorbital. Teeth villiform, in bands on jaws. 
Six branchiostegals; gill-membranes with a narrow free fold across 
isthmus. 
Distance from anus to base of outer ventral ray, two-fifths longer 
than orbit, contained 3.0 times in length of head; distance between 
ventral and isthmus, nearly one-third longer than orbit, contained 
3.35 times in length of head; distance between anus and isthmus, 
1.62 in head. 
Scales large: in 44 series between the lateral line and the origin 
of the second dorsal (excluding the lateral line series), in 54 series 
a short distance behind that point; the number then decreases pos- 
teriorly. Each scale of the body is well armed by from 5 to 7 
strongly spinous carinae. The spinules are long and strong, but 
not grooved and widened basally as in C. smithi (fig. 20); their 
by 
number is 5 to 7 on the median carina, which is slightly stronger 
