FISHES OF HAWAIIAN ISLANDS. 
607 
anal opposite and nearly equal; no lateral line; head and body thickly beset with minute photophores 
which can be distinguished only by the aid of a lens, and are most abundant along lower half of sides; 
two series of larger photophores along each side of ventral line. 
Leptostomias Gilbert, new genus of Stomiidx ( macronema ). 
Leptostomias macronema, new species. Plate 72, fig. 3. 
Type, 74 mm. long, from station 4177, vicinity of Niihau Island, depth 319 to 451 fathoms; type, 
No. 52056, U. S. Nat. Mus. 
Head 13 hundredths of total length without caudal; greatest depth (at occiput) 7; greatest depth 
of trunk 5; depth of caudal peduncle 3; width of trunk 3; length of snout 4; diameter of orbit 2; 
interorbital width 3; length of upper jaw 8; length of gular filament 60; distance from tip of snout to 
ventrals 65; from ventrals to front of anal 21; length of ventrals 8.5; base of anal 11; distance from tip 
of snout to front of dorsal 85; base of dorsal 8. D. 16; A. 20; V. 8; P. 7. 
Snout rather slender, much as in Eustomias, its upper profile concave owing to the upward projec- 
tion of the premaxillaries; teeth in a single series in each jaw, slender, fang-like, alternately long and 
short, about 7 or 8 on each side in mandible and premaxillaries, longest teeth a pair of canines near 
front of upper jaw corresponding to a pair of slightly shorter canines in mandible; a single slender 
tooth on extreme outer angle of vomer on each side, a similar tooth near middle of each palatine, and 
a pair on tongue; gill-rakers short, spine-like, 9 on horizontal limb of outer arch; gular filament very 
long, reaching nearly to base of ventrals, expanded near tip and then again tapering. 
Color of head and body jet-black; barbel black on its basal half, translucent or whitish distally; 
fins translucent. 
Four small photophores on side of head, one a short curved bar on hinder edge of orbit, the others 
small round spots, one on subopercle, one near tip of maxillary, one near mandibular angle; a series 
of photophores on branchiostegal membrane, one for each interradial space; in addition to the 
minute luminous points thickly covering the surface, there are 2 longitudinal series of photophores 
along each side of mid-ventral line, the lower series of each side passing between ventral fins and forming 
closely approximated pairs; of the latter, 42 are in front of ventral fins, 16 between front of ventrals 
and anal, 8 opposite base of anal, and 6 on caudal peduncle; the anterior spots of this series are some- 
what irregular in arrangement. The upper longitudinal series are well below middle of sides, and 
extend from head to opposite front of anal, containing 63 photophores. 
Only the type known. 
Family PARALEPID^. 
Lestidium, new genus. 
Like Sudds, but the skin wholly naked, except for a series of small scales along course of lateral 
line, which are wholly embedded and concealed beneath the skin; lateral line terminating about oppo- 
site middle of anal fin; dorsal inserted behind ventrals; adipose fin above last anal rays; mid-ventral 
region compressed and carinate, the fleshy keel extending from vent to isthmus; vomer toothless; pre- 
maxillaries forming entire margin of jaw and provided with a series of short, backwardly-hooked 
teeth; mandibles and palatines containing long fangs; branchiostegal rays 7 in number, the membranes 
overlapping and connate anteriorly, free from the isthmus; pseudobranchiae present; a photophore 
directed downward and backward at low T er orbital margin; sensory canals of head much branched, 
the tubes covering the opercles, mandibles, and preorbitals. 
Lestidium Gilbert, new genus of Paralepidx ( nudus ). 
Lestidium nudum, new species. Fig. 236. 
Type, 20 cm. long, from station 3899, Pailolo Channel, between Molokai and Maui, depth 283 to 
284 fathoms; type, No. 51615, U. S. Nat. Mus. 
Head 22 hundredths of length to base of caudal; greatest depth 8.5; least depth of caudal peduncle 
2; longitudinal diameter of orbit 4; interorbital width 2.7; length of snout 11; length of maxillary 
10.5; tip of snout to ventrals 54, to dorsal 61, to anal 86. D. 9; A. 33; V. 10; P. 13; lateral line with 68 
concealed scales. 
F. C. B. 1903, Pt. 2—3 
