WEST AMERICAN CRUSTACEA, 565 



pair of ambulatory legs ; hand rather narrow, oblong, 

 about as long as the preceding joints combined, somewhat 

 compressed, and concave on the inner face; fingers 

 about as long as the palm, subcylindrical, hooked at the 

 tip and not dentate on the inner margin. Ambulatory 

 legs subequal (the last pair a little shorter than the oth- 

 ers), moderately slender, and somewhat compressed, the 

 joints not unusually widened; the tarsi are rather slender, 

 curved, and from one-half to two-thirds the length of the 

 propodi. Abdomen of female rounded, slightly longer 

 than broad, and covering the entire sternal area. The 

 body and legs are covered with a uniform short, dense 

 pubescence. 



Length, 9.75 mm.; breadth, 10 mm. 



Locality: Muleje Bay, Gulf of California. 



One specimen from a vial containing a specimen of 

 Pinnotheres margarita Smith, which it much resembles 

 in form and pubescence. This species is very readily 

 distinguished from C . concharum Rath. M. by the shorter, 

 stouter, and less compressed ambulatory legs and the 

 presence of the longitudinal sulci on the carapax, which 

 are entirely absent in that species. 



PSEUDOPINNIXA grcn. UOV. 



Carapax much broader than long, the anterior margin 

 nearly straight, the frontal process deflexed. Orbits 

 nearly round. Antennules obliquely or transversely pli- 

 cated, the fossettes communicating with each other beneath 

 the front. Buccal area small, subtriangular. External 

 maxillipeds with the ischium rudimentary, the meros large, 

 triangular; palp three-jointed, the terminal joint joined to 

 the tip of the preceding one. First pair of ambulatory 

 legs the largest, the others successively diminishing in 

 length, the last pair being quite small. Abdomen of fe- 

 male small, not nearly covering the sternal area. 



