658 



BULLETIN OF THE TNITED STATES FISH COMMISSION. 



diameter, its first ray sliglitly produced, liaH 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 <if second dorsal, its distance from tip of snout 0.4 total length to base of caudal; 

 ventral rays attached for slightly more than Ijasal third, tiie inner ray a little longer than the outei', 

 extending to base of third anal ray, its length equaling that of head; pectorals reacliing beyond front 

 of anal, their length 1.4 in head; lateral line distiiu't tliroughont its course. 



Scales covering head, excei>t mouth parts, branchial membranes, suborbitals, and the greater j)art 

 of snout; on snout they are confined to 2 narrow lines, which diverge forwards and pass above nostrils. 



Color in life, light lirownish; belly jiale blue; dorsal and anal dusky, with a siibmarginal 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 M.\CROURID.J 



Gadomus melanopterus, new species. Fig. 2.56. 



Type, 27.S mm. long, from station 40L'S, vicinity of Kauai Island, depth 444 to 47H fathoms; type. 

 No. 51606, If. S. Nat. Mus. 



Head 5.7 in total length; depth tl.M; head ami trunk .S.H; pyloric cicca long, 15 in number. I>. ii. 

 9; P. 17-19; V. 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 develo])ed than in 

 the majority of the species; greatest width of head eqiiid to length of snout and eye, 0.6 the greatest depth 



Fl«. 2.^ti. — lladoiiiiis iwhuuii'l'viis (lilbL-rt. new sppcios. 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, e(]ualing length of maxillary; 

 vertical diameter of eye 10 mm., horizontal diameter 12, interorliital width 11, length of snout 14; 

 horizontal iliameter of eye contained 4.3 times in head; himler margin of eye 0.1 its own diameter in 

 advance of the middle of head; teeth minute, equal, depressilile, in narrow bands in each jaw, the pre- 

 maxillary band extending to extreme angle of mouth, the length of maiidilmlar band 0.2 less; mandible 

 everywhere well included; teeth of jaws nowhere opposed; in both jaws the l)ands 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- 



