1 895- No. 8. SOUTH-AFRICAN ENTOMOSTRACA. 43 



Description of the female. 



The length of ackilt specimens measures o,68 mm., and this form 

 accordingly grows to a somewhat larger size than the preceding one. 



The shell is (comp, figs 3 a & 3 b) comparati^-ely much more tumid 

 than in that species, its greatest width considerably exceeding the height. 



Seen laterally (fig. 3 a), it exhibits a somewhat semilunar form, with 

 the greatest height about in the middle. The dorsal margin is boldly 

 curved, sloping somewhat more steeply in front than behind. The ventral 

 margin exhibits, in the middle, a distinct, though rather shallow, sinus. 

 Both extremides are evenly rounded and nearly ecjual, the anterior one 

 being, however, as usual. Hanked by a narrow hyaline border. 



Seen from above (fig. 3 b), the shell appears broadly ovate, with the 

 •greatest width considerably behind the middle. It tapers, anteriorh', to an 

 obtuse point, whereas, posteriorly, it is broadi}- rounded. 



The valves are slightly unequal, smooth, semipellucid, and clothed 

 with delicate hairs, which, as usual, are more densely crowded at each 

 extremity. 



The shell is whitish or light straw-coloured, and proA'ided with a 

 number of well-defined dark green patches, which, as in most other 

 species, form 3 interrupted trans^'ersal bands. 



Observations. Only a few specimens of this form, all of them of 

 female sex, were secured. They occurred in the same acjuarium in which 

 the preceding species was hatched. 



Gen. Fotainocifpris, Brady. 



18. Pota^mocypris gregaria, G. O. Sars, n. sp. 

 (PI. 5, fig. 4, a— c). 



Specific Characters. Shell somewhat compressed and everywhere 

 densely hairy, but without any trace of spines : — seen laterally, of a 

 rounded triangular form, the greatest height occurring in the middle, 

 dorsal margin strongly arched, forming, in the middle, a nearly angular 

 bend, ventral slightly sinuated, anterior extremity rounded, posterior blunted: 

 — seen from above, oblong ovate, more pointed anteriorly than posteriorly. 

 \\ah-es nearly equal, flanked, anteriorly, by a narrow hyaline border, 

 surface dull, granular. Colour dark green. Length of adult female 

 0.70 mm. 



Remarks. This new species resembles, in shape, the European P. 

 aculeata Lilljeborg, but is at once distinguished by the absolute want of 



