a 
414 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
(e) The head is densely covered with small spinous scales or prickles, especially 
numerous on top of head and on opercles. In J. canaliculatus the head is either naked 
or sparsely covered, and the opercles are almost or quite naked. 
(f) Three pairs of slender filaments on top of head, the anterior pair the largest, 
placed above back of orbit; the second pair is in front of and slightly within the 
occipital ridges, the third pair on occipital spines. An additional pair on opercles 
seems to be less constant. The supraocular pair alone is present in J. canaliculatus. 
(g) The mucous canals and pores, though large, are less developed than in J. cana- 
liculatus, the fish having in general the bathybial characteristics less pronounced. 
The agreement with J. ewryops is closer than with I. canaliculatus. In fact it seems 
to differ from J. ewryops only in the much smaller eye and somewhat wider inter- 
orbital space, agreeing with J. ewryops in all those respects in which it differs from 
TI. canaliculatus. In I. vicinalis the eye is 23 to 3 in head, and but 14 times length of 
snout, and the least interorbital width is 11 or 12 times in head. In J, ewryops (co-type 
No. 45367, U. S. Nat. Mus.) the eye is 24 times in head and twice the length of the 
snout, and the least interorbital width 16 times in head. It does not seem probable 
that the species will vary to that extent. 
Dorsal 1x-21 to 23; anal 18; pectoral 18; caudal 9. Head 3} to 3} in length; 
depth 53. Maxillary reaching middle of pupil, 2} in head. Upper preopercular 
spine slender, forked at tip, directed upward and backward; the second and third 
spines simple, slender, directed downward and backward, the fourth downward 
and forward. I{nterorbital space shallowly grooved, the groove widening back- 
ward into an occipital depression bounded in front by the somewhat elevated 
interocular space, laterally by the occipital ridges. The supraorbital rim is elevated 
in front and behind. The occipital ridges are low, broad, and rounded anteriorly, 
becoming narrower and more crest-like posteriorly. In addition to the prickles and 
plates already mentioned, there is a band of spinous scales behind axil of pectorals, 
Spinous dorsal low, the longest spine 24 in head, the longest ray of soft dorsal 2 
in head. Pectorals reaching beginning of horizontal portion of lateral line, the 
lower rays thickened, their membranes incised. Ventrals short, scarcely reaching 
vent. Anal papilla large. 
Color in spirits: Light-brown above, with four blackish crossbars, one under 
spinous dorsal joining the dark axillary patch, two under soft dorsal, and one at base 
of tail merging into the uniform deep brown of the under parts. Head, light brown | 
above and below; subocular ring dark brown, this streak widening forward and 
crossing upper and lower lips. A small brown patch at base of exposed portion of 
maxillary. Opercle blackish. Upper half of pectorals light, with or without a 
brown basal bar, the distal portion indistinctly barred with light brown. Lower 
half of pectorals and all of ventrals dark brown or black. Dorsals blackish, darkest 
above crossbars on back. Anal black. Caudal whitish, dusky above toward tip. 
Numerous specimens 50 to 110 mm. long, from stations 3324, 3330, 3331, and 3332, 
Bristol Bay, Alaska, at depths of 109, 351, 350, and 406 fathoms, respectively. 
The following notes are drawn from one of the co-types (No. 45367, U. S. N. M.) of - 
I. euryops, kindly loaned to us for that purpose by Dr. Bean. 
Specimen 77 mm. long, 65 mm. to base of caudal fin. Head 22 mm. to end of oper-_ 
cular spine; depth 11; orbit 10}; snout 54; maxillary 11; interorbital width 1}. 
Dorsal 1x-23; anal 19; pectoral 18; caudal 9. Preopercular spines as in J. vici-— 
nalis, the upper spine abnormal on one side, showing three points instead of two, — 
Below the forked spine are three others—one directed backward and a little down-— 
ward, one nearly vertically downward, and one downward and forward. Nasal spines © 
strong. Occipital ridges obvious, with easily perceptible slender spines about as in | 
I. vicinalis, the ridges broadly rounded anteriorly, scarcely ridge-like until imme- : 
diately in front of spines. Head rather closely invested with scales, scarcely so | 
rough or so numerous as in J. vicinalis, but more so than in J. canaliculatus. Opercle — 
covered with scales. Filaments as in J. vicinalis—one pair above eyes, one ante- | 
