36 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Typical of sarsiellids, the caudal process of S. capsula is more 

 anteriorly located on adults than on juveniles (pi. 3c, d). The shell 

 of S. capsula illustrated by Brady and Norman (1896, pi. LX : figs. 1-4) 

 has the caudal process posterior, suggesting that it is a juvenile. The 

 lateral outline of the carapace is similar to that of the specimen 

 illustrated in plate 3c of this paper. 



Both adult females and juveniles have 3 prominent radial ridges 

 anteriorly. Three ventral radial ridges on juveniles may be present 

 on adults also; however, it is not possible to be certain of the ridges 

 on the adults because the ventral margins of both adult shells on the 

 type slide are considerably distorted. Juveniles, adult females, and 

 males (A'^. obliqua) (pi. 3c) have the flat-topped, crestUke prominence 

 on the posterodorsal part of the shell. 



Measurements: Because adult specimens on shde no. 1911.118, 

 M3985 (British Museum) are somewhat distorted, the dimensions 

 given below must be considered as approximate (the letters used to 

 designate specimens refer to specimens illustrated in plate 3) : 



Norman (1869, p. 293) recorded the length of the carapace of S. 

 capsula as about Ks inch [about 1.7 mm]. Brady and Norman 

 (1896, p. 678) recorded the length of S. capsula as 1.2 mm and height 

 as 1 mm. The dimensions given by the latter authors are close to 

 my measiu'ements of female adults. 



First antenna (fig. 16a): 1st joint bare; 2nd joint with 1 dorsal 

 bristle; 3rd joint with 1 dorsal and 1 ventral bristle and without suture 

 separating it from 4th joint; 4th joint with 1 dorsal bristle and 2 long 

 and 1 short ventral bristles; 5th joint with stout terminal ventral 

 bristle; 6th-8th joints apparently with normal number of bristles, 

 but difficult to discern because of poor condition of slide. 



Brady and Norman (1896, p. 678) reported only 2 ventral bristles 

 on the 4th joint. 



Second antenna (fig. 166) : exopodite with 9 joints decreasing in 

 width distally; 2nd-8th joints each with 1 long stout bristle; 9th 

 joint with 1 short and 1 long bristle; bristles on 2nd-9th joints without 

 hau's or marginal spines; endopodite 1-jointed with 2 short ringed 

 proximal bristles. 



Brady and Norman (1896, p. 678) described the endopodite as a 

 "secondary branch rudimentary, consisting only of a little nodulous 



