20 



RATHBUN 



the abdomen, and reaches about to the end of the inner uropod ; it is 

 broadly channeled, extremity truncate or slightly convex, and armed with 

 about 13 slender bristles. Eyes brown in alcohol. In the first pair of 

 legs the palm is about one third longer than the fingers ; in the second 

 pair the right merus has 14 spines, the left 13. 



PASIPH^A PACIFICA Rathbun. 

 Pasiphcea pacifica Rathbun, Proc. U. S. Nat. Mus., xxiv, 905, 1902. 



The carapace is a little less than half the length of the abdomen, 

 measured on the median line ; it is laterally compressed and rises into a 

 well-marked ridge extending nearly to the posterior margin and terminat- 

 ing anteriorly in the median tooth; the ridge is rounded except on 



Fig. 2. PasipJicea ^acifica. S (X ij)- Station 31 



the forward part of the gastric area, where it forms a thin, sharp keel 

 terminating in a sharp pointed tooth, which is not nearly so advanced as 

 the anterior margin. This tooth is variable, being more or less inclined 

 upward ; its terminal portion is usually slender, its anterior margin con- 

 cave. Median tooth of frontal margin narrow, rounded; infra-orbital 

 and antennal angles rounded and ill-defined; antero-lateral angle 

 rounded and slightly obtuse. Behind this angle the antero-lateral 

 margin runs almost directly backward for a short distance, then turns 

 abruptly downward, forming an obtuse angle, and joins obliquely the 

 infero-lateral margin. Above this sinus there is a sharp spine on a level 

 with the middle of the basal segment of the antenna. There is a well- 

 defined blunt ridge on each side of the carapace, running from the 



