MUSEUM OF COMPARATIVE ZOOLOGY. 209 
than it is in the Fiji form, and that the dorsal crest is smaller and somewhat 
differently shaped. The fifth and sixth abdominal segments are much shorter 
in proportion to the length of the telson in the former. The antennulary pe- 
duncle is only one third as long as the carapace, while in the typical P. cristata 
it is about one half as long as the carapace. Furthermore, the flagellum of the 
antenna in the former is longer than the body, whereas in the latter it is 
described as being only one half as long. 
Length 65 mm.; carapace, 22 mm.; telson, 7.5 mm. 
Station 3385. 286 fathoms. 4 specimens. 
“« 3396. 259 ah 2 bd 
«¢ 3403. 384 ts 2 re 
«3406. 551 se 3 S 
Pasiphaeia magna, sp. nov. 
This species is second only to P. princeps Smith in dimensions. It is most 
similar to P. tarda Kroyer, from the North Atlantic. Differs from the latter 
species by having the dorsal line of the carapace more convex, the posterior 
part of the carapace higher in proportion to the anterior part, the dorsal keel of 
the carapace rounded except on the anterior gastric region, and the anterior 
rostrum-like tooth longer and differently shaped. The proportional length of 
the segments of the third pair of legs appears to be quite different in the two 
species : in P. tarda, according to Kréyer, the propodus and dactylus are of 
equal length and four times as long as the carpus, while in P. magna the 
dactylus is even shorter than the carpus, which is itself only one sixth as 
long as the propodus. In P. tarda, following Kroyer, the lower margin of 
the second segment of the second pair of legs is furnished with three spines ; 
in P. magna this margin is unarmed but for the tooth at its distal end. 
Length, 145 mm. ; carapace, including the anterior dorsal tooth, 55 mm. 
Station 3384. 458 fathoms. 1 specimen. 
Family PENEIDZ. 
Sicyonia affinis, sp. nov. 
This species is the Pacific coast representative of Sicyonia edwardsii! of the 
Atlantic coast of America. It agrees with S. edwardsii in the form and denti- 
tion of the carapace, but differs in the form and sculpture of the abdominal 
segments. In S. edwardsit the first four abdominal segments are rugose, and 
ornamented on the sides with two deeply impressed transverse lines, followed 
by another less deeply incised near the hind margin of each segment; more- 
over the pleure of these segments are angulated below. In S. affinis these 
1 Sicyonia edwardsii Miers, Ann. Mag. Nat. Hist., 5th series, VIII. 367, 1881; 
Sicyonia carinata (Olivier) Milne Edwards, Ann. Sci. Nat., XIX. 344-346, Plate IX. 
Fig. 9, 1830; nec Sicyonia carinata (Olivi). 
