412 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
ward; the preopercular margin is arched evenly forward above the 
rounded angle; the oblique suborbital ridge is little curved down- 
ward; it extends from below the anterior nostril to below the hind 
margin of the orbit. The snout is equal in length to that of the 
round orbit, each being contained 3.7 times in the head (in all three 
specimens). The interorbital width is narrow, being contained 5.0 
(4.65 to 6.0) times in the head; the least suborbital width is slightly 
less than half the orbital length. The moderately oblique upper 
jaw extends from below the lateral rostral tubercle to below the 
front edge of the pupil (to past vertical from center of eye in the 
smaller paratypes); its length is contained 3.4 (3.2 to 3.5) times 
in the head, being greater than the length of the snout. The outer 
series of teeth in the premaxillary band are stouter and more widely 
spaced than the others. The barbel is variable; it is slender in the 
type, in which it is contained 2.6 times in the orbit; slender in the 
paratype from station 5215, 2.4 in orbit; very thick and much 
longer in the other paratype, from station 5124, 1.6 in orbit. The 
gill-membranes are united without a free fold. Six branchiostegal 
rays. The shit before the first gill-arch is reduced, 3.5 in orbit; the 
gill-rakers are rudimentary. 
Eight (or nine in a paratype) rows of scales separate the front 
of the second dorsal fin from the lateral line series (six below last 
ray of first dorsal fin); 18 rows of scales were counted from the 
lateral line downward and backward to the origin of the anal. The 
scales are reduced in size on the belly and on the head exclusive 
of the opercular region. The gular and branchiostegal membranes 
are wholly naked. The spinules on the scales are definitely arranged 
in parallel or subparallel series, and no definite quincunx order can 
be made out except on some of the scales on the head and on the 
back before the dorsal fin; each scale of the body bears about 15 
(11 to 16) of these series. There are no carinae, as each spinule 
rises independently from the surface of the scale. The individual 
spinules are of subequal size and of conic form; the last one of 
each series projects a little beyond the margin of the scale. The con- 
spicuous terminal rostral tubercle, of semispherical form, is armed 
with about eight radiating rows of strong spinules; the smaller 
lateral tubercles are of oval outline, with a less definite arrangement 
of the smaller spinules. 
Six pyloric caeca were counted in one paratype, and eight in ine 
other; they are shorter than the orbit in both cases. The anus is 
placed immediately before the anal fin; its center is located behind 
the base of the outer ventral ray a distance slightly less than the 
postorbital length of the head, and equal to the distance between 
the ventral base and the isthmus (somewhat longer in a paratype). 
