1922.] 



W. M. Tattersall : Indian Mysidacea. 



449 



Antennal scale subequal in both sexes, reaching the distal end 

 of the antennular peduncle in the female, not quite extending thus 

 far in the male, three and a half times as long as broad, terminal 

 lobe not quite so long as broad, slightly overreaching the terminal 

 spine of the outer margin. 



Tarsus of the thoracic legs without a secondary joint. 



Pseudobranchial rami of the second to the fourth pleopods of 

 the male spirally twisted, the terminal setae of the fourth pair not 

 modified. 



Telson short, not extending to the distal end of the proximal 



Text-fig. i. — Siriella hanseni, sp. nov. 



a, anterior end of female ; b, antennal scale , c, third thoracic limb, 

 endopod. All X 65. 



joint of the exopod of the uropods, scarcely one and a half times 

 as long as broad at the base, apex broadly rounded, almost truncate, 

 and armed in the middle line with three equal small spinules and 

 a pair of plumose setae longer than the spines flanking them, three 

 large spines on the lateral margins of the telson at the base, distal 

 portion of the lateral margins armed with about 12 spines 

 gradually increasing towards the apex, the three spines on each 

 side of the apex not much longer than the preceding spines and 

 more or less subequal in size. 



Inner uropod shorter than the outer, its inner lower margins 

 with about ten somewhat distantly placed spines without any 



