WEST AMERICAN CRUSTACEA. 567 



ceding pair; the penultimate joint is relatively wider than 

 in the preceding pairs; tarsus similar to the others. Ab- 

 domen of the female rather small, not covering one -half 

 the sternal area, and seven-jointed; the segments grad- 

 ually increase in width from the first to the third, then 

 decrease rapidly in width to the last one, which is longer 

 than the others, subtriangular in shape, but with a rounded 

 apex. The sides of the posterior portion of the abdomen 

 are concave. 



Lockington, in his description of this specimen, says 

 that the "color in spirits" is "bright orange," and the 

 specimen still retains a decided orange tinge. 



Length of carapax, 5 -{-mm.; width, 11 mm. 



Locality: Angeles Bay, Gulf of California. 



This species, together with the one here described as 

 Pinnixa toincntosa, were both described by Lockington 

 as Pinnixa nitida under the erroneous impression that 

 they were the male and female of the same species. He 

 evidently had some misgivings about their specific iden- 

 tity, for he says: "A single specimen of each of the two 

 crustaceans just described was collected on the same day 

 at the same locality — namely, Angeles Bay, Gulf of Cal- 

 ifornia — and the two were placed by the collector (Mr. 

 W. J. Fisher) in the same vial. Had it not been for 

 this, I should certainly have never linked together two 

 specimens so distinct in the relative proportions of the 

 limbs themselves, as well as of the joints of those limbs; 

 one covered in many places with an abundant pubescence, 

 the other smooth and shining- above and below. The 

 proportions of the ambulatory limbs of the female agree 

 with the genus Pinnixa, but in the male the irtcrease of 

 size is transferred to the second pair. Should these Crus- 

 tacea prove to be distinct the female should be Pinnixa 

 tonientosa, while the male must be placed in some other 



