ASPERA, 



THIRD MAXILLIPED. 



648 PROCEEDINGS OF THE NATIONAL MV8EV3I. vol.41. 



The antennules have the last segment of the peduncle more slender 

 and a little longer than the preceding. 



The third maxillipeds have the basis of nearly the same width 

 tliroughout, about one-seventh of its length along the inner edge, its 

 distal outer corner not produced; the merus is only 

 a little narrower than the ischium and has a small 

 tooth internally. 



The first legs have the basal segment slightly shorter 

 than the distal segments together and carrying a row 

 of teeth on its lower (or outer) surface. The carpus 

 is a little shorter than the propodus and longer than 

 the dactylus. 



In the second pair of legs the carpus is about as long 

 as the last two segments together. 



The third and fourth pairs of legs are without 

 exopods. 



The peduncle of the uropods is about as long as the 

 Fig. 68.— DiASTYLis tclson and has a row of rather slender spines on its 

 FEMALE, [p^^QY edge. The rami are wanting in the single 



YTT T TPTrn ^~> CJ o 



specimen examined. 



Male. — A young male specimen about 9 mm. in length differs from 

 the female described above in having a longer pseudorostrum, the 

 ridges on the side of the carapace much less distinct (those on the 

 dorsal surface are well developed) and the peduncle of the uropods 

 shorter than the telson. 



RemarJcs. — From other species of Diastylis that have the surface of 

 the carapace spinulose, this species appears to be dis- 

 tinguished by the arrangement of the ridges on the 

 carapace and by the shortness of the abdomen. 



Locality. — Shahafka Cove, Kodiak, Alaska; W. H. Dall, 

 July, 1880; U.S.N.M. 44031, 44032; 1 male, 1 female, 

 holotype (44032). 



A female specimen, which, though considerably larger 

 (15.6 mm. total length) than that described above, has 

 only small rudiments of oostegites visible, may provi- fig. 69.-diasty- 

 sionally be referred to the same species. It differs from ^^^ aspera, fe- 



1 • 111 -in MALE, TELSON. 



the female specimen described above m the liatter 

 dorsal surface of the anterior part of the carapace and in some details 

 of the sculpturing; also in having the body beset with long feathered 

 hairs, which, on the carapace, are arranged in rows along the more 

 prominent ridges. 



Locality. — Albatross station 5023; Okhotsk Sea, off eastern coast 

 Sakhalin Island, vicinity of Cape Patience; 75 fathoms; bottom tem- 

 perature, 30.9°; U.S.N.M. 44030; 1 female. 



