448 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
ridges in particular forming a crest unusually high for a species 
of the subgenus Paramacrurus. The posteroventral angle of the 
subopercle is produced backward and slightly downward into a 
pointed flap. The length of the rounded-oblong orbit is contained 
3.25 times in the head, 1.2 in the snout, 1.15 in the postorbital 
length of the head (measurements of orbit in smallest paratype: 
3.4 in head, 1.35 in snout, 1.0 in postorbital). The least interorbital 
width, which is contained 1.5 (1.3 to 1.6) times in the postorbital, 
lies above the front of the pupil; behind this point the slightly 
convex sides of the interorbital diverge strongly; least interorbital 
width, 2.2 (to 2.25) in postorbital. The mouth is rather small, the 
length of ‘the upper jaw, which extends backward to below the 
hind margin of the pupil, is contained 4.0 times in the head (3.9 to 
4.3 times in the paratypes). The outer series of the villiform 
teeth forming the premaxillary band is scarcely enlarged. Length 
of the free portion of the barbel, 6 (3.5 to 5.5) in postorbital. 
Branchiostegal rays, six; the gill-membranes are attached to the 
isthmus, leaving a narrow free fold. 
The distance from the center of the anus to the base of the 
outer ventral ray varies from about two-fifths (in the type) to 
one-fourth the distance from the anus to the base of the outer 
ventral ray, the latter distance is slightly shorter, or shghtly longer 
than, the postorbital length of the head, and is usually, but not — 
constantly, a little longer than the distance from the ventral to 
the isthmus. 
A well-marked, narrow, scaleless ventral fossa, widest anteriorly, 
extends forward from the peritroct to between the ventral fins. 
An ovoid gland-like body lies imbedded in the body wall above the 
front part of this fossa, and is connected by a strand of tissue with 
the peritroct; it is without apparent skeletal support. The “gland” 
is pigmented with black on its ventral and posterodorsal surfaces, 
while the posterior stand of tissue is pigmented on its lower side 
only. We have described similar structures in other groups of 
Coelorhynchus, as well as in species of Hymenocephalus and Lion- 
Urus, 
The pyloric caeca are rather short and slender, 28 to 32 in num- 
ber (counted in four paratypes). 
Scales in 6 or 54 series from the origin of the second dorsal fin 
to, but excluding, the lateral line scale. There are at most 5, and 
often fewer, spinous carinae on the scales, but they are much 
stronger and somewhat more divergent than in related species. 
The median ridge on the scales of the body bears as many as 9, but 
usually fewer, strong retrorse spinules, imbricate on one another, 
and increasing in size posteriorly; the last one projects well beyond 
