GNATHOPHAUSIA BREVISPINIS. 217 



longer than the rest of the series. The pleuraj 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 antennae 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 antennie 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 antennaj. 



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 33G1. 1471 fathoms. 1 specimen. 



1 

 1 

 1 



1 " 

 1 " 



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 Suhm's 

 description and figure the third and fourth abdominal segments of G. gracilis 



* Trans. Linn. Soc. London, Zool., 2d Ser., I. 33, Plate IX. Pig. 1, 1875. 



