by the generic appellation, the chief character, upon which the 

 genus has been based, is the absolute want in the animal of 

 swimming power, in which respect the species agree with those 

 of the genus Cinxfana, to which latter group the type was in 

 fact referred by Baird. Besides, there are a few other charac- 

 ters, mentioned in the above diagnosis, partly derived from the 

 shell, partly from the limbs, which may be regarded as of ge- 

 neric value. Two of the species, which I have succeeded in 

 raising from dried Australian mud, undoubtedly belong to this 

 genus, and also several of the exotic species, described by Baird 

 Brady, maj probably be found on closer examination of the 



4. Herpetocypris stanleyana, (King). 



(PI. IT, figs 1-2; PI. V, figs 5-7). 



Condom, xfanfa/ana, King, Papers & Proceedings of the 

 Royal Society of Van Diemens Land, Vol. Ill, P. I, p. 66, PI. 

 X. H (according to Brady). 



('iipns y/mifri/fina, Brady, Notes on Freshwater Entomo- 

 straea from South Australia. Proceed. Zool. Soc. London 1886, 

 P- 89, PI. VIII, figs 3, 4. 



Xfu'rijir Chtmtrtrrs. - Shell seen laterally subreniform, ta- 

 I»f-*i*f*il anteriorly, greatest height, rather behind the middle and not 

 1,11 attaining the half length, anterior extremity obliquely roun- 



posterior obtuse, dorsal margin evenly curved, ventral dis- 

 t nu-.tly sinuated in front of the middle, its posterior part being 

 n "ivex : seen from above oblong, greatest width about equalling 

 of the length, sides convex, anterior extremity more pointed 

 than posterior. Surface of shell smooth, but finely dotted all 

 °ver and beset at each extremity with fine hairs. Valves in 

 adult specimens very unequal, the right being by far the larger 

 ■ n( considerably overlapping the left both posteriorly and an- 

 eriorly f exhibiting moreover a double- seti tenuis lip, the inner 

 tying at a considerable distance inside the outer. Colour yellow- 



