On some South-African Phyllopoda. 37 



between the ribs is nearly smooth, without any distinct 

 reticulation or striation (see fig. 1 a). 



The enclosed animal exhibits the structure characteristic 

 of the genus. Figs. 5 and 6 on the accompanying plate 

 represent the whole body of a female and a male specimen 

 as exactly as possible, both exhibited from the left side. 

 The sexual differences are very obvious, and are expressed 

 in the rather dissimilar form of the rostral part of the head, 

 the different development of the antennulæ, the transforma- 

 tion of the 2 anterior pairs of legs in the male to prehensile 

 organs, and partly also in the somewhat different structure 

 of the tail. As I have elsewhere given a detailed description 

 of the several parts of the body and its appendages in the 

 nearly-allied species E. Packardi, it may be sufficient here 

 only to point out some of the more conspicuous differences 

 between the 2 species. 



As to the form of the head, its rostral part appears in 

 the present species somewhat more prominent than in the 

 Australian form, the distance from the tip of the rostrum 

 to the ocular prominence equalling in the female (see fig. 5) 

 the distance from that prominence to the cervical sulcus, 

 whereas in E. Packardi it is considerably shorter. The tip 

 of the rostrum, moreover, which in E. Packardi is quite 

 simple, is produced in the present species to a slightly 

 procurved, blunt point. Finally, the fornix is less abruptly 

 bent in the middle than in the above-mentioned species. In 

 the male (fig. 6) the rostrum is still larger, and is obtusely 

 rounded at the tip. 



The antennulæ in the male (fig. 6) are considerably 

 larger than in the female (fig. 5), fully equalling the head 

 in length; their lateral lobules are very prominent, and the 

 outer part distinctly articulated (see fig. 7). 



