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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 91 



three large proximal spines separated by an interval from the distal 

 series of spines in which the larger spines are separated by groups 

 of three, four, or five smaller spines, apex armed with a single pair of 

 long stout spines, between which are three equal small spines and 

 a pair of plumose setae. 



Fig. 4. — SirieUa occidentalis, n. sp. a, telson ; b, uropods. All X 64. 



Uropods (text fig. 4^) with the exopod longer than the endopod; 

 proximal joint of the exopod twice as long as the distal joint, with 

 about 13 spines on the outer margin occupying more than half the 

 margin; distal joint of the exopod almost twice as long as broad; 

 endopod with a closely set row of spines on the inner margin extend- 

 ing from the statocyst to the apex, arranged as larger spines separated 

 by groups of smaller spines. 



