On Fresh-water Entomostraca. 27 



figured by Prof. Weismann in the ephippium of M. para- 

 doxa. Before the ephippium is detached from the shell, 

 the 2 winter-eggs occupy (see fig. 2) a similar juxtaposed 

 situation in the matrix to that observed in the preceding 

 species. 



The adult male (fig. 8) scarcely exceeds a length of 

 0,70 mm., and on the whole closely resembles the male of 

 M. australiensis, though the antennulæ appear still more 

 elongated, considerably exceeding half the length of the 

 body. The 1st pair of legs are constructed in the very 

 same manner as in the male of the said species, and the 

 zoosperms in this form also are represented by simple, clear, 

 nucleated cells. 



As in the preceding species, the body in both sexes is 

 highly transparent, especially in the male. In the female 

 generally a faint bluish violet tinge, more rarely changing 

 to reddish, may be observed. The winter-eggs are brick-red. 



Observations. — This form was also raised in con- 

 siderable numbers in some of my aquaria, and was watched 

 during numerous succeeding generations. All the specimens 

 exactly agreed with each other, as to the form of the head, 

 the slender antennulæ, and the denticulated claws of the 

 tail. Its habits are much as in the preceding species. 



Occurrence. — The mud that yielded this species, was 

 taken by Mr. Whitelegge _ from a pond at the corner of 

 Bourke Street and Botany Hoad. A spirit sample from 

 the same place contained numerous specimens of the same 

 species, exactly agreeing with those raised here in Chris- 

 tiania. 



