174 STALK-EYED CRUSTACEA. 



the b.isal se"-ment. This stylocerite assumes anteriorly the form of a vertical 

 scale which does not reach forward so far as the distal end of the segment ; 

 it is armed with a minute, sharp spine at the anterior extremity of its supe- 

 rior mar"-in. The basal segment of the second antenna is armed with a 

 slender, sharp spine at the anterior end of its lower surface. The antennal 

 scale is lanceolate, truncate at the apex, and furnished with a spine at the 

 distal extremity of the outer margin ; the flagellum of the antenna is very 

 slender and longer than the body. The third maxillipeds reach forward 

 be^-ond the tip of the antennal scale ; their distal segment is setose on the 

 inner side, rounded at the apex, and nearly twice the length of the antece- 

 dent segment ; the exopod reaches beyond the proximal end of the carpus. 

 The second pair of legs are a little longer than the first pair, the chela being 

 somewhat slenderer and longer-fingered ; the carpus of the second pair is 

 armed with a prominent spine on the antero-inferior border, and the merus 

 of the same appendage is likewise furnished with a single spine near the 

 middle of its inferior margin. The third pair of legs are very slender, reach- 

 ing forward as far as the proximal end of the carpus of the second pair ; the 

 merus is very long, — by far tlie longest segment of the appendage, — the 

 carpus short and cylindrical, the propodite long and thread-like, the dactylus 

 short, slender, and acute. The fourth pair of legs are very short, reaching, 

 when extended forward, hardly to the proximal end of the merus of the 

 second pair of legs ; the dactylus is slender, blunt at the end, and it, as well 

 as the propodite and, to a less degree, the carpus, is furnished on the inner 

 side with stiff hairs. The fifth pair of legs, when stretched forward, fall a 

 little short of tlie middle of the merus of the second pair ; their terminal 

 segment is spatulate and fringed with long setae. The outer plates of the 

 last pair of abdominal appendages are considerably longer than the inner 

 plates, and these are much longer than the telson. 



Length, 65 mm. ; carapace, 22 mm. ; telson, 7.5 mm. 



Station 3.385. 28G fathoms. 4 specimens. 

 " 3396. 259 " 2 " 



" 3403. 384 " 2 " 



" 3406. 551 " 3 



This form is closely allied to P. crisiata Bate, of which one specimen was 

 dredged by the " Cliallenger " in 315 fathoms off the Feejee Islands. 



On comparing the Americnn species with Bate's figures of the type of 

 P. emtafa, it appears that the carapace of the former is considerably longer 



