A REVIEW OF THE MYSIDACEA 



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center and a single pair of long lateral spines; the exopod of the 

 uropods longer than the endopods with more than half of the margin 

 of the proximal joint furnished with spines; spines along the distal 

 third of the lateral margins of the telson irregular, with smaller spines 

 in series between the larger spines; both rami of both the third and 

 fourth pairs of pleopods of the male with modified distal setae; 



Figure 18. — Siriella rooscvelti Tattersall: a, Antennal scale and peduncle, X 45; b, third 

 thoracic limb, X 45; c, telson, X 83; d, uropods, X 45; t, copulatory appendage of the 

 eighth thoracic limb of male, X 80. 



pseudobranchial rami on the second to the fourth pleopods of the 

 male spirally twisted; distal joint of the outer uropod less than twice 

 as long as broad ; antennal scale without spines on the outer margin. 

 Carapace similar in both sexes, only slightly produced into a short 

 triangular rostral plate with a pointed apex, which extends scarcely 



