ß G. O. Sårs. 



specimen in the collection measured no less than 7. SO mm. 

 in length, by a height of 3.30 mm. and a width of 3.00 mm., 

 a truly gigantic size for a fresh-water Ostracod, and yet 

 this specimen would seem not to be fully grown, as the 

 ovarial tubes are but slightly developed. The male speci- 

 mens are a little smaller, though their average length is 

 from 6 72 to 7 mm. For comparison, it may be mentioned, 

 that the largest known European fresh-water Ostracods, 

 Herpetocypris strigata and H. reptans, do not quite attain a 

 length of 3 mm., and accordingly do not reach even half the 

 size of the South African form 



Seen from the side (fig. 1), the shell of the female 

 exhibits a pronounced oblong reniform shape, with the 

 greatest height not nearly attaining half the length, and it 

 appears somewhat broader in front than behind, though the 

 difference is not very great. The dorsal margin is per- 

 fectly straight and horizontal, occupying more than half the 

 length of the shell, and it is defined in front by a distinct 

 angle occurring just above the eye. Behind, it joins the 

 posterior margin by an abrupt bend. The ventral margin 

 is rather deeply and evenly sinuated in the middle, and is 

 continued both in the anterior and posterior margins with- 

 out any intervening prominence. The anterior extremity is 

 broadly and regularly rounded, whereas the posterior is 

 somewhat produced and slightly deflexed, the greatest 

 curvature occurring below the axis of the shell. 



The shell of the male (fig. 2), when viewed laterally, 

 appears somewhat broader behind than in the female, with 

 the posterior extremity more obtusely rounded, its greatest 

 curvature occurring nearly in the axis of the shell. Other- 

 wise it agrees rather closely with that of the female. 



Seen dorsally (fig. 3), the shell in both sexes appears 



