568 CALIFORNIA ACADEMY OF SCIENCES. 



genus." An examination of these very specimens which 

 are preserved in the collection of the California Academy 

 of Sciences and from which our descriptions and figures 

 are taken, has convinced us that they, indeed, belong to 

 different genera. Moreover, the specimen Lockington 

 considered to be a male is not a male at all, as an exam- 

 ination of the vulvtE and the appendages on the under 

 side of the abdomen unmistakably shows. The abdomen 

 is small for a female of this group, and Lockington prob- 

 ably did not lift it up and examine the ventral side, but 

 concluded that the specimen was a male from the small 

 size of that org;an. As Lockington named the female P. 

 touioitosa, in case it should prove distinct, this name should 

 stand, since the supposed male belongs to a different 

 genus. 



PiNNIXA TOMENTOSA Lock. 



Pinnixa tomenlosa Lockington, Proc. Cal. Acad. Sci. vii, y>. 156. 



Carapax very nearly twice as broad as long, smooth, 

 and rounding off towards all the margins; the upper sur- 

 face is somewhat flattened and there is a shallow depres- 

 sion behind the gastric region behind which the carapax 

 is convex but not ridged. Antero-lateral margin broadly 

 rounded and marked by a ridge only towards the outer 

 extremity. Front short, with a longitudinal groove in the 

 middle and a slight depression behind the transverse an- 

 terior margin. The distance between the orbits is about 

 one-fourth the breadth of the carapax. Orbits transverse. 

 Antennules obliquel}' plicated. Epistoma very short. Ex- 

 ternal maxillipeds nearly longitudinal; meros large, sub- 

 quadrate, the distal portion of the outer margin convex; 

 the penultimate joint of the palp is moderately narrow 

 and tapers from the base to a rounded extremity: the 

 third joint is spatulate and joined near the base of the 



