58 DEEP SEA FISHES. 



dorsal, above the base of the pectoral, fifth spine as long as the eye, anterior 

 segmented rajs shorter than those of //. medUerraneus or of H. japonicus. 

 Anal origin below the eleventh ray of the dorsal. Pectorals rather broadly 

 ronnded on the hind margin, three fourths as long as the head, inserted 

 above the axils of the venti-als. 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 c(jlors 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 XL, 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. Fue. gy. s. bk. .sp. 



Trachichthys mento sp. n. 



Plate XL 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 thiy 

 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 



