MUSEUM OF COMPARATIVE ZOOLOGV. 213 



Length, 215 mm.; carapace, 101mm.; rostrum, 42 mm.; antennul scale, 

 33 mm.; telson, 33 mm. 



Station 3353. 695 fathoms. 2 females. 



" 3358. 555 " 1 male. 



" 3384. 458 " 3 females. 



» 3393. 1020 " 3 females. 



" 3394. 511 " 3 males, 1 female. 



" 3395. 730 " 1 male, 1 female. 



Haliporus nereus, sp. nov. 



Integument membranaceous. Carapace lightly granulated. Rostrum about 

 one third the length of the rest of the carapace, horizontal, armed with six 

 teeth above, ciliated below. Median dorsal line of carapace carinate, with two 

 teeth on the posterior half of the gastric region. The anteunal, branchiostegian, 

 and hepatic spines are present, besides one behind the branchiostegian, and 

 another still farther back on the hind border of the cervical groove. Orbital 

 region definitively bounded by an hepatic and a gastro-hepatic sulcus. The 

 hindmost of the lateral spines of the carapace lies in the anterior angle of a 

 triangular field enclosed by branches of the cervical groove ; from the infero- 

 posterior angle of this triangle two carinse run backward along the branchial 

 area; the upper one ends at the postero-lateral margin of the carapace, the 

 lower one meets the inferior submarginal carina of the branchial area before 

 attaining the posterior border. These two carinse, with the submarginal ridge 

 of the carapace, enclose a long oval area on each branchial region. Third to 

 sixth abdominal segments carinated ; on the sixth segment the carina ends in 

 a small tooth. Eyestalks about one half the length of the rostrum ; eyes large, 

 black, much broader than their stalks. 



In the female there is a large process, covered with stiff hairs, and flat- 

 tened on the inner side, developed from the base of the third pair of legs. 

 Behind this process lies a pair of flat, setiferous sternal processes. Between 

 the legs of the fourth pair there hangs in the median line a nearly vertical 

 curtain-like partition, notched on the free lower margin, and flanked by two 

 lower blunt setiferous tubercles. The sternum of the posterior thoracic seg- 

 ment has a slightly elevated median longitudinal ridge, and a low transverse 

 ridge at the posterior boundary of the segment. 



Length, 81 mm.; carapace, 31 mm.; rostrum, 8 mm. 



Station 3353. 695 fathoms. 1 female. 



