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



of this genus by the somewhat angular form of the shell in the female, 

 as well as, partly, by its colouring. 



Description of the female. 



Fully adult specimens do not exceed in length 0,78 mm., and this 

 form is accordingly of rather small size. 



The shell is Acry much compressed (comp. fig. i a & i b,, and nearl\- 

 quite smooth, with only a few delicate hairs on both extremities. 



Seen laterally (fig. i a), it exhibits a somewhat irregular oval reniform 

 shape, with the greatest height considerably behind the middle, and about 

 equalling ^/s of the length. The dorsal margin is nearly straight in the 

 middle, and slightly ascending posteriorly, joining both the anterior and 

 posterior edges by an abrupt, almost angular bend. The ventral maro-in 

 is distinctly sinuated in the middle. The anterior extremity appears some- 

 what obliquely rounded, whereas the posterior is blunted and somewhat 

 expanded below. Seen from above (fig 16), the shell exliibits a verv 

 narrow oblong form, the greatest width scarcel\- exceeding 2/5 of the 

 length, and occurring behind the mitldle. Both extremities appear some- 

 what blunted, though the anterior one is somewhat narrower than the 

 posterior. 



The valves are slighdy unequal, the left one being the larger and 

 overlapping the right, in front, by a rather broad hyaline border. A similiar, 

 though somewhat narrower border, is also seen along the inferior part of 

 the liind extremity. Within the ventral sinus the left right valve is like- 

 wise found to be overlapped by the left. The inner duplicatures of the 

 valves are not ^ery large, though the anterior one is somewhat broader 

 than die posterior. 



The surface of the shell is perfectly smooth and polished, without 

 any perceptible sculpturing. • 



The colour is yellowish orange, clouded with irregular dark reddish 

 brown patches, and small dots of a somewhat lighter hue. 



The eye, as in most other species, is very large and conspicuous. 

 Likewise the muscular pits in the centre of the valves may be clearly 

 discerned. The several appendages would seem to agree in all essential 

 respects with those in other species of the genus. 



The adult male t;fig. i c) is somewhat smaller tlian the female, scar- 

 cely exceeding in length 0,60 mm. It is easily distinguished by a some- 

 what deviating shape of the shell, its dorsal margin forming a very strong 

 and quite even curve, and declining more gentl}- to the posterior extremity, 

 which latter appears far less broad than in the female. In living specimens, 



