288 Records of the Indian Museum. [Vol.. XXIV, 1922.] 



slender rostrum, the shorter carpus of the first leg, the form of the 

 fingers of the second leg (which gape and are devoid of large teeth) 

 and by the position of the spines on the telson. In all three 

 species the dactylus of the last three legs is biunguiculate. 



P. californiensis is known only from Santa Cruz I , California ; 

 P. pinnae only from the Gulf of California l and P. margarita from 

 the Gulf of California and the Gulf of Panama. 



I The specimens I have seen are from I.os Angeles Bay, one of the original 

 localities. 



