610 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The scales which form the ridge along the breast are more rounded in outline and are thinner I 
than in P. stereope, the ridge is lower and the striae and spines are fewer and weaker; the ridge along 1 
each side of abdomen is also much lower. 
Dorsal region dark brown, a narrowly V-shaped extension of this color invading the silver}' of the I 
anterior part of the sides, extending downward to a point midway between dorsal and ventral profiles; J 
middle of sides silvery, less brillant than in spinosus and stereope, the abdomen and lower parts gen- 1 
erally purplish instead of silvery; base of ventrals and base of outer caudal lobes blackish. 
The luminous organs are arranged as in P. spinosus and stereope, but those above the base of the I 
anal fin are only 11 or 12 in number, and the series is less perfectly continuous, the anterior half being 1 
placed at an angle with the posterior half of the series, the sixth spot being decidedly nearer the base I 
of the anal than the seventh; there is also a much wider interval between the anal and the caudal j 
series, where the two are continuous or nearly so; all the photophores are directed downward, and are I 
visible from a point below midventral line; none of them can be seen from the back; on the other 1 
hand, the mouth is directed vertically upward and the eyes obliquely upward and outward. 
Nothing is definitely known concerning the habits of these fishes. The specimens taken by the 1 
Albatross were probably captured* near the bottom, but their stomachs contained nothing but Globi- ] 
gerina and other Foraminifera. 
The species is named for my friend and associate on the Hawaiian Expedition, Prof. C. C. Nutting, j 
of the University of Iowa. 
The relations of P. nuttingi to P. spinosus and P. stereope have been given in the body of the descrip- ' ] 
tion. P. spinosus and P. stereope agree with each other in all details of color and form, differing so ■ 
far as known only in the size of the accessory post-temporal spines. P. nuttingi is farther removed i 
from both of these species, differing in the darker coloration of the lower parts, the broader dark 
area along the back and its longer V-shaped extension below the predorsal region, the arrangement 
of the anal photophores, the longer, slenderer caudal peduncle, and the weaker spination. In P. 
nuttingi, the accessory spines along the lower edge of the post-temporal spine are reduced to fine | 
serrations. 
Polyipnus laternatus Garman (Mem. Mus. Comp. Zool., Vol. XXIV, 1899, p. 238), from the . 
Barbados, is distantly related to these species, having palatine teeth, longer pectoral fins, and widely 
different form, predorsal blade, and spines. It should be eliminated from this genus. To the j 
synonymy of P. laternatus, Garman refers by inadvertence Goode and Bean’s figure of Polyipnus ; 
spinosus (Oceanic Ichthyology, pi. 39, fig. 148). The latter is merely a rough copy (reversed) of Gun- 
ther’s figure of the type of P. spinosus (Deep-sea Fishes, Challenger,. pi. 51, fig. b), as appears at once 
on comparison. A number of disconcerting errors have crept into the list of plates and figures given in 
the Oceanic Ichthyology, so the greatest care must be exercised in referring to these figures. In the 
explanation of plate 39, fig. 148 is said to be Argyropelecus olfersii, while fig. 149 (labeled on the plate 
Paralepis coregonoides) is called Polyipnus spinosus. In this instance the names on the plate corre- 
spond with their use in the text, and the explanation of the plate should be disregarded. 
Specimens were taken at the following stations: Nos. 3867, Pailolo Channel, 284 to 290 fathoms; 
3920, off the south coast of Oahu, 265 to 280 fathoms; 4088, approach to Pailolo Channel, 297 to 306 
fathoms; 4089, approach to Pailolo Channel, 297 to 304 fathoms; 4090, approach to Pailolo Channel, 
304 to 308 fathoms; 4091, approach to Pailolo Channel, 306 to 308 fathoms; 4097, approach to Pailolo 
Channel, 286 to (?) fathoms; 4121, off the northwest coast of Oahu, 216 to 251 fathoms; 4134, vicinity 
of Kauai, 225 to 324 fathoms. 
Polyipnus spinosus Gilbert & Cramer, Proc. U. S. Nat. Mus., XIX, 1897, 416; not of Gunther. . 
Family HALOSAURID/E. 
KEY TO HAWAIIAN SPECIES OF HALOSAUKOPSIS. 
i. Snout not produced far beyond the mouth, its preoral length less than one-third its preocular extent. 
6. Vertex gently arched transversely 
66. Vertex 
verticalis, p. 611 
proboscidea , p. 612 
aa. Snout much produced beyond the mouth, its preoral length nearly half its preocular extent 
