On Fresh-water Entomostraca. 49 



greatest height about in the middle. The anterior extremity 

 is somewhat oblique, and much lower than the posterior, 

 which is broadly rounded. The dorsal margin forms a bold, 

 and rather even curve, joining the anterior and posterior 

 edges, without any intervening angle. The ventral margin 

 appears almost straight, though there is a slight approach 

 to a median sinus. Seen from above (fig. 1 b), the shell 

 appears narrowly oblong, with the lateral contours nearly 

 parallel, and both extremities somewhat blunted, though the 

 anterior is somewhat narrower than the posterior. 



The valves are very unequal, the right one being much 

 the larger, and projecting considerably beyond the left along 

 the middle of the dorsal face. Anteriorly it overlaps the 

 left valve by a thin hyaline border, and a similar, though 

 much narrower border is also seen at the infero-posteal corner. 



The surface of the shell is perfectly smooth, without any 

 distinct sculpturing. It is, however, dotted all over with a 

 reddish brown pigment, similar to that found in C. ophthal- 

 mica. At each extremity the shell is clothed with very 

 delicate hairs, somewhat more densely crowded together 

 anteriorly. The eye may be pretty well traced through the 

 shell, and the muscular pits in the centre of each valve 

 are also rather conspicuous. 



Occurrence. — Of this small species, solitary specimens 

 were picked up from a sample taken by Mr. Whitelegge 

 from the Waterloo Swamps. 



Gen. Cypris, Müll. 



22. Cypris bennelong, King. 



Cypris bennelong, King, Proc. Roy. Soc. Van Diemen'a 

 Land, 1855, p. 63, PI. X. A. 



