GNATHOPHAUSIA BREVISPINIS. Dl 
longer than the rest of the series. The pleure of the abdominal segments 
are armed with two marginal spines, the sixth segment having in addition 
a tooth at the infero-posterior angle of its posterior section. The apical 
projection of the telson is divided into four terminal spines; there is, more- 
over, a small tooth on the external margin of the projection. 
The eyes are small, not exceeding the eye-stalk in diameter; a small 
tubercle is situate on the inner side of the eye-stalk, a little way behind the 
cornea. The outer flagellum of the first pair of antenne is excessively long, 
being nearly twice the length of the whole body; the inner flagellum, on 
the contrary, is not longer than the carapace not including the rostrum. 
The second segment of the second pair of antenne is furnished with 
an acute tooth at the anterior end of its exterior border, and a slender spine 
is observable on the lower face of the following segment. The scale is broad, 
not more than twice as long as broad, the inner edge strongly arched, the 
outer edge slightly arched; the outer edge is armed with a few (two to 
four) small teeth on its distal half, and it terminates in an acute spine, 
which surpasses the distal extremity of the scale. The flagellum is somewhat 
shorter than the outer flagellum of the first pair of antenna. 
The maxillipeds are provided with distinct exopods. The remaining 
pairs of appendages do not differ in any important regard from the generic 
type. 
Length, 60 mm. ; carapace, including rostrum and dorsal spine, 33 mm. ; 
rostrum, 14 mm.; dorsal spine, 4 mm. 
Station 5561. 1471 fathoms, 1 specimen. 
 dofon L201 =< 1 ss 
2 34005-1322" _ “ 1 
Ke 340G- = ool =< 1 gs 
ceed, PISO. 1 
ue 2 6“ 1 6c 
In two of the six specimens obtained (Stations 3361, 3406), the tooth or 
short inferior spine at the infero-posterior angle of the carapace is nearly or 
quite obsolete. 
This species is closely related to G. gracilis W.-Suhm,* one specimen of 
which was secured by the “Challenger” Expedition from a depth of 1500 
fathoms in the Atlantic, lat. 1° 22’ N., long. 26° 36’ W. According to Sulim’s 
description and figure the third and fourth abdominal segments of G. gracilis 
* Trans. Linn. Soc. London, Zodl., 2d Ser., I. 33, Plate IX. Fig. 1, 1875. 
28 
