On some South-African Phyllopoda. 35 



of legs is greater, viz., 23 pairs (in JE. Paclcardi only 20). 

 The unusually large development of the epipodite in some 

 of the legs, is another character by which the present form 

 distinguishes itself from most other species. Finally, the 

 asymmetry of the terminal processes of the caudal plates in 

 the male is more conspicuous than in any other species with 

 which I am acquainted. 



Description. — The length of the shell in apparently 

 fully grown female specimens amounts to 7 mm , by a height 

 of about 5 mm. That of male specimens is somewhat larger, 

 attaining a length of 8 mm., by a height of not quite 5 mm. 



As to form, the shells of female and male specimens 

 exhibit rather conspicious differences, enabling them to be 

 readily distinguished without any examination of the enclosed 

 animal. In the female, it exhibits, seen from the side (fig. 1), 

 a somewhat irregular, broadly oval form, with the greatest 

 height slightly exceeding 2 /3 of the length. The umbones 

 are rather prominent, and placed much nearer the anterior 

 than the posterior extremity, though scarcely so far in front 

 as in E. Packardi. The dorsal margin, behind the umbones, 

 is nearly straight, and exhibits, at its junction with the free 

 edges of the valves, a rather slight angle. The ventral 

 margin forms a tolerably even curve, and passes without any 

 interruption into the anterior and posterior margins. The 

 anterior extremity of the shell, in front of the umbones, 

 occupies about 1 .U of the length of the shell, and appears, 

 in a lateral view of it, obtusely rounded, whereas the posterior 

 extremity expands obliquely from the dorsal angle, being 

 narrowly rounded at the tip. Seen from above (fig. 2), the 

 shell appears moderately tumid, with the greatest width, 

 occurring across the umbones, almost attaining half the 

 length . 



