FISHES OF HAWAIIAN ISLANDS. 
653 
much longer than in D. xenica, reaching to within half a millimeter of base of pectoral. In the type 
specimen of xenica, 65 mm. long, a space of 2 mm. intervenes between the subopercular spine and the 
base of the pectoral. Gill-slit entirely lateral, little wider than the distance betweeh the tips of the 
2 spines; lower end of gill-slit immediately above base of ventral spine; preopercular margin adnate, 
not armed; occiput slightly roughened, less so than in xenica. 
Yentrals with their inner margin wholly free, not joined by membrane to base of pectorals, as in 
Callionymus; ventrals also less widely separated at base. In I), hawa.iiensis, they are much longer than 
in xenica, reaching base of second anal ray; pectorals reaching well beyond ventrals. 
First dorsal spine longest, the second and third of about equal length, the upper margin of fin 
concave; when the fin is declined, the tips of all the spines extend beyond base of first dorsal ray; soft 
dorsal and anal similar, low, of equal length; anal a little more posteriorly inserted; the last dorsal and 
anal rays fall short of base of caudal, when depressed; caudal fin short, rounded; no trace of lateral line. 
Color in spirits very light gray above and below, the back with faint traces of 5 darker cross-bars; 
first and second cross-bars under origin and end of spinous dorsal, the third and fourth equally spaced 
under soft dorsal, the fifth on back of tail; dorsal region faintly spotted and mottled with darker; 
5 faint ocellated round spots form a V-shaped figure with its apex on nape, the diverging arms inclosing 
front of spinous dorsal; posterior part of spinous dorsal black; two narrower horizontal black lines on 
soft dorsal, caudal with 2 faint dark bars on basal portion; two small black spots at base of pectoral; 
fins otherwise unmarked. 
Only the type specimen was obtained. 
Family ATELEOPID^E. 
Ateleopus plicatellus, new species. Fig. 253. 
Type, 55 cm. long, from station 3868, Pailolo Channel, 294 to 684 fathoms; type, No. 51586, 
U. S. Nat. Mus. 
Head 15 hundredths of total length; greatest depth (at occiput) 9; length of head and trunk 31; 
predorsal length 17.5; preventral length 10; length of pectoral 14; longest dorsal ray 13.5; length of 
ventral 6. Length of snout 36 hundredths of head; preoral length of snout, measured axially, 15; 
interorbital width 35; diameter of eye 14; length of maxillary (measured from front of premaxillaries) 
35; width between angles of mouth 26. D. 9; P. 14; V. 3; A. and C. 104. 
Snout very blunt, overpassing mouth for about two-fifths its length; mouth wide, horizontal; max- 
illary reaching a vertical from middle of orbit, a trifle shorter than length of snout; anterior half of each 
premaxillary containing a very narrow band of small teeth, the posterior half, and the entire mandible, 
toothless. Also in A. japonkus Schlegel, the mandible is toothless, although described and figured 
with a band of teeth. Vomer and palatines toothless; premaxillaries very protractile, but the maxillary 
firmly adnate, skin of head passing over it without interruption; upper and lower lips finely plicate as 
in Catostomoids. Posterior nostril an oblique slit immediately in front of upper part of orbit, the ante- 
rior in a short procumbent tube with the opening directed forward; a strong protuberance above eye, 
a smaller one behind and above it; a pair of strong ridges running from occiput forward between eyes 
to snout, the space between them concave; angle of lower jaw provided with a spinous process; preop- 
ercular margin not free; opercle with a single low ridge and no spines; sensory canals of head furnished 
with very few minute pores; gill-openings wide, continued forward to below pupil, the membranes 
wholly separate, free from isthmus; 4 complete gills, the fourth arch with a slit behind it; gill-rakers 
short and thick, minutely toothed and a little movable, 10 in number on anterior arch ; vertical limbs 
of all the arches adnate, or free for a very short distance next the angle, the horizontal limbs also 
attached anteriorly, somewhat narrowing the slits; pseudobranchia: wanting; branchiostegals 7; skin 
very delicate, easily broken, scaleless; lateral line present, but inconspicuous, composed of a few large 
distant pores. 
The anterior insertion of the dorsal fin is above the axil of the pectorals, the length of its base half 
postocular length of head, its tip reaching vertical from vent; pectorals failing to reach vent by a dis- 
tance nearly equaling one-third their length; the ventral appears to be a simple filament, but on dissec- 
tion 2 slender rays appear closely joined for their entire length, with a short rudiment at their base; 
they taper uniformly to their tips, which are not dilated and flattened as in japonicus. In the type their 
