612 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
middle toward either end; their greatest width equals that of the premaxillary bands; their anterior 
ends are separated by a distance about equaling one-fourth their length; pterygoid bands much nar- 
rower and longer, and separated by a narrow interspace from palatine bands; tongue smooth, basi- 
branchials toothed as usual. 
With the exception of the cheeks and a narrow area above the opercles, the head is scaleless. 
Origin of dorsal over middle of ventral fin; base of ventral fins below the thirteenth enlarged 
scale, and nearer head than vent by about half length of fin; outer ventral ray simple, shortened, and 
closely adnate to the second; the inner rays of the 2 ventrals joined by membrane, which apparently 
extends to their tips; pectorals very long, reaching somewhat beyond front of dorsal fin; longest anal 
rays half as long as snout. 
Color brownish black on back and sides, with a black vertebral streak behind dorsal fin; head, 
belly, and lower parts generally a deep blue-black, as is also the lining of mouth and gill-cavity; fins 
dusky translucent; photophores borne beneath a series of much enlarged scales. 
This species is very close to H. kauaiensis, but differs in the concave vertex, the longer snout and 
the differing proportions. 
Taken at the following stations: Nos. 3985, vicinity of Kauai, 430 to 477 fathoms; 4141, vicinity. of 
Kauai, 437 to 632 fathoms; 4151, vicinity of Bird Island, 313 to 800 fathoms. 
Halosauropsis proboscidea, new species. Plate 76 . a 
Type, 422 mm. long, from station 4111, Kaiwi Channel, between Molokai and Oahu Islands, 
depth 460 to 470 fathoms; type, No. 51614, U. S. Nat. Mus. 
Length of head 35 hundredths of distance from tip of snout to vent; longitudinal diameter of 
orbit 6; interorbital width 3.5; preocular length of snout 15.5; preoral length of snout 7; length of 
maxillary 9.5; greatest depth of body 15; distance from tip of snout to front of dorsal 71; distance 
from tip of snout to base of ventrals 67 ; longest pectoral ray 21; longest ventral ray 12. D. 11 (including 
anterior rudiment, the last ray cleft to the base, destroyed in the type); V. 9; P. 14; enlarged scales 
between vent and gill-opening 29; gill-rakers 4-j-ll on outer arch, several of the anterior being 
tubercular rudiments, the longest half the diameter of the eye; pyloric caeca 8. 
The opercular margin is slightly nearer base of ventrals than tip of snout; snout very long as in 
H. rostrata (Gunther) and II. affinis (Giinther); middle of pupil occupying middle of length of head; 
horizontal diameter of the eye 0.3 postocular length of head; interorbital space very narrow, its width 
contained 1.4 in the ocular diameter; occiput and interorbital space flat or gently convex; maxillary 
extending slightly beyond anterior margin of orbit, its length 3.8 in head; premaxillaries constitut- 
ing 0.3 the dentary surface of upper jaw; teeth showing a slight constriction below tip, the latter flat- 
tened but not widened; palatine bands crescentiform, the 2 fully confluent anteriorly on the median 
line, wider than the premaxillary bands, and tapering but little anteriorly; pterygoid bands very 
narrow and separated from the palatines by an interspace half the length of palatine band; tongue 
smooth, basibranchials with a wide band of teeth; head naked, except the usual scaly area on cheeks 
and above opercles. 
Origin of dorsal fin but a little behind root of ventrals; base of ventrals below seventeenth 
enlarged scale, and nearer vent than head by half the orbital diameter; outer ventral ray shortened 
and adnate, the inner rays of the 2 fins united by membrane, at least in the smaller cotype; pectorals 
long, equaling length of snout and eye, but falling far short of base of ventrals. 
Color light grayish brown, with a faint bluish tinge; a blue vertebral streak behind dorsal fin; 
head and a narrow streak along belly and lower side of tail blue-black, as are also the mouth and gill- 
cavity; dorsal, pectorals, and ventrals only faintly dusky. 
Photopores connected with a series of much enlarged scales. 
A young specimen, 200 mm. long, considered a cotype, differs from the type in being everywhere 
jet-black, and in having the ventrals inserted a little farther forward, so that the origin of the dorsal 
is over the middle of their length, and their base is slightly nearer head than vent. In this specimen 
the gill-rakers are also 4 --(-11; the branchiostegal rays 11. 
H. proboscidea is closely related to H. affinis (Gunther), from south of Japan, but has a longer, nar- 
rower head, with much narrower orbital space and more posteriorly inserted ventrals. It differs also 
in the anterior confluence of the palatine bands of teeth. 
Specimens were taken at stations Nos. 4111, Kaiwi Channel, 460 to 470 fathoms, and 4138, vicinity 
of Kauai, 438 to 476 fathoms. 
i Aldrovcindia proboscidea on plate, by 
