WEST AMERICAN CRUSTACEA. 569 



preceding one and projects a short distance beyond it. 

 Chelipeds scarcely as long as the fourth pair; the meros 

 trigonal, hand oblong, compressed, longer than all the 

 preceding joints combined; fingers but httle more than 

 one-half the length of the palm; the pollex is wide but 

 abruptly narrowed near the hooked tip; dactyl curved, 

 toothless, subuncinate at the apex. Ambulatory legs 

 compressed; the first pair shorter and more slender than 

 the second; the tarsus is rather slender and about as 

 long as the propodus. The second pair stands about in- 

 termediate in size between the first and third pairs; the 

 tarsus is not quite as long as the propodus and is relatively 

 stouter than that of the first pair. Third pair not greatly 

 exceeding the second in length, the tarsus much shorter 

 than the propodus and much stouter than the tarsus of 

 the second pair; there is no flange or groove on the pos- 

 terior margin of the meros. Fourth pair shorter and rel- 

 atively stouter than the first ambulatory legs but reaching 

 beyond the distal end of the meros of the third pair; tar- 

 sus short and stout. The fourth pair closely resembles 

 the third in most points except size. Abdomen of female 

 transversely elliptical and covering the entire sternal sur- 

 face. The carapax and legs were covered with a very 

 short pubescence. 



Length of carapax 7.5 mm.; breadth, 14 mm. 

 Locality: Angeles Bay, Gulf of California. 



PiNNIXA TUBICOLA Sp. nov. 



General form subcyHndrical. Carapax about two and 

 one -half times as broad as long, strongly curved down- 

 wards towards the anterior margin and sides. There is a 

 shallow, transverse depression behind the gastric region 

 behind which is a convex (not crested), transverse intu- 

 mescence, from which the carapax curves sharply down- 



