54 RATHBUN 
carina behind the middle of the carapace, armed with 9 movable spines, 
four of which are on the carapace (the hinder one inserted very slightly 
behind the middle) and 
five on the base of the 
rostrum; 1 subterminal 
immovable spine ; lower 
margin armed with 11 
Z c= = -~_ immovable spines. 
ee) _——_ Antennular peduncle 
5 f extending to middle of 
Fic. 17. Pandalopsts longirostris. Station 3316. a. Side of 
carapace (natural size). 6. Acicle (x 2). c. Chela (x 34). scale. Scale as long as 
¢ cee carapace. Antennal pe- 
duncle reaching to middle of second antennular segment. Maxillipeds 
reaching almost to end of scale, very stout and hairy. The first pair 
of pereiopods overlaps the basal fourth of the last joint of the maxilli- 
peds; second pair extending beyond acicle by length of chela, carpus of 
21 joints, chela equal to the seven adjoining segments, fingers almost 
as long as palm; third pereiopods extending beyond the acicle by the 
length of the dactylus and two thirds of the propodus. 
Sixth segment of abdomen two and a half times as long as wide; 
telson broader than in P. aleutica. 
Dimensions. —Male, length 112 mm., carapace and rostrum 59 mm., 
rostrum 41 mm. 
Distribution.—Off liuliuk Harbor, Unalaska, 309 fathoms, station 
3316, Albatross, 2 males (one without rostrum). 

PANDALOPSIS DISPAR Rathbun. 
Plate, fig. 2. 
Pandalopsis dispar RATHBUN, Proc. U. S. Nat. Mus., XXIV, 902, Ig02. 
Surface very finely and closely punctate. Rostrum two to two and a 
half times the length of the rest of the carapace, arched over the eyes, 
the remainder slightly ascending. Median crest occupying two thirds 
the length of the carapace, posterior spine at the anterior third, spines 16 
to 21, three or four of which are on the carapace, spines closely placed 
on the arch, distant on the remainder of the rostrum. Inferior spines 9 
to 15, extremity bifid or sometimes trifid. Antennal spine long and 
slender; pterygostomian spine minute. 
Eyes very large, with a very small but distinct ocellus outside the 
corneal area. 
Antennal peduncle reaching two fifths the length of antennal scale; 
