On Australian, Entomostracmis. 67 



2. C. lutea. PI. X. G. 



Somewhat like the preceding, but the anterior extremity 

 is smaller than the 'posterior. The shell is polished, and the 

 rami are entirely destitute of the pencil of hair ; colour dark 

 green. 



Locality ; — Pond near Sydney Cove, with Cypris Benne- 

 long. 



Genus III. Newnhamia. 



Character . — Antennae like those of Cypris, rami furnished 

 with a pencil of long hairs; eyes two, distinct, pedunculated, 

 and having a large corresponding tubercle in the shell on 

 each valve. A boat-shaped plate on the ventral margin. 

 The animal swims on its back, and generally is found at 

 the under surface of the water 



1. N. fenestrata. PI. IX. A. 1—12. 



The shell is very tuberculose. Towards the margin are 

 a few short setae springing from the tubercles : the back is 

 of a light greyish colour, the ventral parts dark, the two 

 extremities are also dark. The eyes, as seen through the 

 ocular tubercles, are very brilliant. The tubercles are 

 rounded at their extremities. In one instance I observed 

 them to be of a different shape and a pointed form. The 

 anterior extremity was larger than the posterior. This may 

 prove a distinct species, but as I am unable to give a 

 more detailed description of it, I can merely suggest that, 

 should it prove distinct from that with rounded tubercles, it 

 may be called N. GuUehni. 



The male differs in appearance from the female in being 

 smaller, and of a slighter form. The female, when swim- 

 ming, its valves being slightly open, appears of almost a 

 cordate form. The rami of the male (fig. 8, 8 a,) carry at 

 their extremity, instead of the four or five stout setae found 

 in Cypris, a single long and jointed seta, each joint carrying 



