On some West-Australian Entomostraca, 25 
| more uniformly light brown. Length of female 1.40 mm, 
of male 1.20 mm. 
Remark.—There cannot be any doubt that this form 
ought to be referred to the genus Cyprinotus of Brady, as 
defined by the present author in another paper!), agreeing 
as it does, in all essential anatomical details, as also in the 
structure of the shell, with the other species belonging to 
this genus. Yet it exhibits well-marked specific differences 
from any of them. For instance, the form of the shell is more 
regularly ovoid than in the other known species, and its 
anterior extremity appears truncated in a most peculiar 
manner. Moreover, the right valve in adult specimens of 
both sexes is raised considerably above the level of the 
left, a circumstance only found in C. cingalensis, but here 
in a still more marked manner. Finally, the colour is diffe- 
rent from that in the other species. I am now of opinion, 
that the Cypris aurea, described by the present author 
from South Africa, should also more properly be referred 
to the same genus, because the structure of the valves is 
essentially the same, and because also this species is pro- 
nouncedly gamogenetic in character. 
Description of the female. 
The shell in fully grown specimens attains a length of 
1.40 mm., a height of 0.90 mm., and a width of 0.70 mm. 
Accordingly, this form grows to a somewhat larger size 
than the 2 other Australian species, C. dentato-marginatus 
and C. cingalensis. 
1) G. O. Sars, On some Australian Fresh-water Ostracoda and 
Copepoda raised from: dried mud. 
