58 DEEP SEA FISHES. 
dorsal, above the base of the pectoral, fifth spine as long as the eye, anterior 
segmented rays shorter than those of HZ. mediterraneus or of H. japonicus. 
Anal origin below the eleventh ray of the dorsal. Pectorals rather broadly 
rounded on the hind margin, three fourths as long as the head, inserted 
above the axils of the ventrals. Ventrals small, two thirds as long as the 
pectorals. Caudal peduncle sharp-edged above and below the bases of the 
fin rays. 
The colors of a fresh specimen are shown on Plate A, fig. 1; the 
alcoholic eclors are grayish brown, blackish toward the ends of pectorals 
and ventrals and toward the base of the caudal, black on the linings of 
the body cavity, and yellowish on the hinder portions of dorsal, anal, and 
caudal. 
The skeleton is figured on Plate X., and Plate XI., fig. 1, shows the 
inside of a longitudinal section of the head, 
Station. Latitude, Longitude. Depth. Temperature. Bottom. 
3403 0° 58’ 30” S. 89° 17’ W. 384 fathoms 43.3° F. Fne. gy. s. bk. sp. 
Trachichthys mento sp. n. 
Plate XI. figs. 2-7. 
Br. r.8; D. 17-18; A. 12-11; V. 7; P. 14-16; I . scales 60 ca., pores 
28; Ltr. 7 + 20 ca.; Vert. 27. 
Excepting the caudal region, the outlines of the head and body of this 
species as seen from the side would approach the subelliptical; the caudal 
peduncle is slender and the caudal fin deeply notched. The form is much 
compressed ; the greatest depth is one half, and the length of the head two 
fifths, of the distance from the snout to the base of the caudal. From 
isthmus to nape the outline of the head is nearly a semicircle; the length is 
less than the depth, and the width is two fifths of the latter; bones of the 
skull fragile, deeply excavated for the vessels of the lateral system; sides 
nearly vertical; crown very convex; a high ridge along the interorbital 
space. Snout longer than the eye, blunt, curving steeply to the crown, chin 
vertical in the anterior halves of the mandibles; symphyseal angle promi- 
nent, sharp. Mouth wide, almost vertical when closed; maxillary three 
fifths as long as the head, wider than the eye, and slightly indented on the 
hind border, upper edge bending up backward, lower edge not forming the 
border of the mouth, supplemental bone as long as the eye. Teeth very 
