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 " 2 « 



" 3403. 384 " 2 



" 3406. 551 " 3 " 



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 Kroyer, 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 PENEID.SI. 



Sicyonia affinis, sp. nov. 



This species is the Pacific coast representative of Sicyonia edwardsii 1 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. edwardsii 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 pleurse 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; nee Sicyonia carinata (Olivi). 



