174 STALK-EYED CRUSTACEA. 
the basal segment. 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 margin. 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 
beyond 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 the 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 the middle of the merus of the second pair; their terminal 
segment is spatulate and fringed with long sete. 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 3385. 286 fathoms. 4 specimens. 
“8396. +259 KS 2 oe 
“3403. +384 ‘e 2 a 
« = 8406. 551 <é 3 gs 
This form is closely allied to P. cristata Bate, of which one specimen was 
’ 
dredged by the “Challenger” in 315 fathoms off the Feejee Islands. 
On comparing the American species with Bate’s figures of the type of 
P. cristata, it appears that the carapace of the former is considerably longer 
se ot . oe oS ae 
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