658 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
diameter, its first ray slightly produced, half length of head, the others regularly graduated; notch 
between dorsals not reaching base of fin; some of the posterior dorsal rays longer than those which 
precede them; median caudal rays slightly more than half length of head; vent vertically below 
seventh or eighth ray of second dorsal, its distance from tip of snout 0.4 total length to base of caudal; 
ventral rays attached for slightly more than basal third, the inner ray a little longer than the outer, 
extending to base of third anal ray, its length equaling that of head; pectorals reaching beyond front 
of anal, their length 1.4 in head; lateral line distinct throughout its course. 
Scales covering head, except mouth parts, branchial membranes, suborbitals, and the greater part 
of snout; on snout they are confined to 2 narrow lines, which diverge forwards and pass above nostrils. 
Color in life, light brownish; belly pale blue; dorsal and anal dusky, with a submarginal black 
streak, the margin white; caudal largely black; pectorals orange-red; ventrals white; terminal half of 
anterior dorsal ray white; axil of pectorals blackish. 
A single specimen known. 
Family MACROURIDvF. 
Gadomus melanopterus, new species. Fig. 256. 
Type, 273 mm. long, from station 4028, vicinity of Kauai Island, depth 444 to 478 fathoms; type, 
No. 51606, U. S. Nat. Mus. 
Head 5.7 in total length; depth 6.3; head and trunk 3.3; pyloric caeca long, 15 in number. D. n, 
9; P. 17-19; Y. 9; 27 scales in an oblique series from first anal ray to middle of first dorsal. 
Head and body compressed, head narrow and rather firm, mucous cavities less developed than in 
the majority of the species; greatest width of head equal to length of snout and eye, 0.6 the greatest depth 
Fie. 256 . — Gadomus melanopterus Gilbert, new species. Type. 
of head; end of snout nearly vertical, profile thence to occiput gently concave; mouth large, terminal, 
oblique; maxillary reaching well beyond vertical from hinder margin of orbit, its length 1.7 in head; 
mandibular barbel very long, extremely slender and delicate toward tip, equaling length of maxillary; 
vertical diameter of eye 10 mm., horizontal diameter 12, interorbital width 11, length of snout 14; 
horizontal diameter of eye contained 4.3 times in head; hinder margin of eye 0.1 its own diameter in 
advance of the middle of head; teeth minute, equal, depressible, in narrow bands in each jaw, the pre- 
maxillary band extending to extreme angle of mouth, the length of mandibular band 0.2 less; mandible 
everywhere well included; teeth of jaws nowhere opposed; in both jaws the bands of teeth are inter- 
rupted for a short distance on median line; palate toothless; gill-openings very wide, the membranes 
free anteriorly, not joined to isthmus; anterior end of gill-slit in advance of vertical from front of pupil; 
a thick valve-like fold of membrane on outer wall of gill-cavity, parallel with outer gill, but every- 
