412 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
The species is represented in our collection principally from Bristol Bay, a few 
specimens only from farther west in Bering Sea. Stations 3224, 3250, 3251, 3252, 3253, 
3254, 3255, 3256, 3279, 3280, 3282, 3283, 3285, 3292, 3293, 3302, 3303, and 3306; depths 173 to 
121 fathoms. 
92. Icelus spiniger sp. nov. (Plate 24.) 
Closely resembling I. bicornis, but differing conspicuously in the armature of the 
dorsal series of plates, in the comparatively plane occiput, and in other characters, 
Head 24 to 3 in length; depth 5. Caudal peduncle very slender, its depth 24 in 
orbit. Mouth large, the maxillary reaching slightly beyond middle of orbit, its 
length one-half head. Teeth very finely villiform, present in rather wide bands in 
jaws and on vomer and palatine bones. Nasal spines strong, separated by the high 
ascending processes of the premaxillaries. Interorbital space very narrow, grooved, 
its width less than one-half diameter of pupil. The orbital rim becomes elevated 
anteriorly and posteriorly, and is, at the latter point, strongly denticulated. Behind 
the orbital region the occiput is shallowly concave, being bounded laterally by two 
low, evenly rounded ridges, which become narrower posteriorly, and end each in a 
strong spine projecting backward in line with the series of dorsal prickles. The 
preopercular spines are similar to those of I. bicornis, the uppermost, as in the latter, 
occasionally simple instead of bifurcate. The second spine is usually directed 
straight backward, and the two following downward and forward. 
The gill-membranes are broadly united, free from the isthmus, and neither pore 
nor slit exists behind the innermost gill. Branchiostegals, 6. Eye large, longer 
than snout, 3 to 3} in head in adults. A slender tentacle present over the posterior 
part of each orbit. A series of plates extends from nape along each side of dorsals 
to back of caudal peduncle, and a second series along lateral line, as in I. bicornis. 
The dorsal series contains 28 to 35 plates, each of which bears at its center a single 
strong spine directed outward and backward. In J. bicornis each plate is trayv- 
ersed by an oblique ridge, the edge of which is denticulated, the central tooth 
being the strongest and corresponding to the single spine present in J. spiniger. The 
latter agrees with J. canaliculatus in having an inner series of dorsal plates alternat- 
ing with the principal series, each of the smaller plates bearing a minute prickle, 
discernible with difficulty. The plates along the lateral line, 41 to 44 in number, 
are similar to those in I. bicornis, having their upper and posterior free margins 
serrulate. A few scattered spinous plates present in axillary region. Dorsal fins not 
connected, the spines very slender and rather high. Pectorals long, reaching front of 
anal; ventrals not reaching vent. 
Dorsal 1x-20; anal 17; pectoral 18; ventral 1,3. Longest specimen, 118 mm. 
Color: Light olivaceous above, white below, the upper parts mottled with dark 
brown. The back has four faint black crossbars, the first under spinous dorsal, the 
second and third under soft dorsal, the fourth at base of caudal. A brown blotch 
on cheek, one on base of pectoral, and an irregular series along full length of body 
just under lateral line. Two prominent black blotches on first dorsal; the second 
dorsal, caudal, and pectoral barred; other fins unmarked. Mouth and gill-cavity 
white. ; 
Numerous specimens from stations 3216, 3223, 3224, 3225, 3226, 3257, 3258, 3263, 3267, — 
3278, 3279, 3280, 3292, 3302, 3311, 3534, and 3336, in 17 to 121 fathoms. These stations 
are located in the vicinity of Unalaska Island and in Bristol Bay, Alaska. 
53. Icelus canaliculatus sp. nov. (Plate 24.) 
A deep-water species, with conspicuous mucous canals and pores, thin cranial 
bones, and ratlxer plain blackish coloration. In other characters it stands some-— 
what intermediate between J. bicornis and I. spiniger. The dorsal plates have the — 
serrulated cross ridge of I. bicornis, while the occiput is but shallowly concave, with 
low bounding ridges ending behind in strong spines, and the posterior rim of the orbit — 
is elevated and denticulated, as in J. spiniger. In its anterior portion, at least, the 
