Fresh-Water Entomostraca from China and Sumatra. 39 



but slightly curved, apical claws subequal, seta of dorsal 

 edge well developed, and occurring at some distance from 

 the claws, apical seta small. 



Male considerably smaller than female, and having 

 the posterior part of the shell more dilated. 



Colour. — Shell rather opaque, of a whitish colour, 



sometimes tinged with light reddish brown. 



Length of shell in female 0-90 i""\ height 0-50 ™"\ width 

 0-34 mm 



Remarks. — This form is nearly allied to the Australian 

 species, /. australiensis G. O. Sars, differing, however, in the 

 strong armature of the posterior part of the shell. 



Occurrence. — Numerous specimens of this form devel- 

 oped in some of my aquaria prepared with mud from China. 



18. Ilyocypris angulata, G. O. Sars, n. sp. 



(PL IV, figs. 9, 9 a). 



Specific Characters. — Female. Ver}^ like the pre- 

 ceding species, but of somewhat larger size, and with the 

 surface of the shell very uneven, projecting on each side 

 to several nodular protuberances, one of which, occurring 

 behind the middle, is remarkably large and angular in form. 

 Both the anterior and posterior edges of the valves, as also 

 the adjacent part of the shell, armed with strong denticles, 

 each tipped with a stiff bristle. 



Colour. — Shell semipellucid, of a whitish colour, with 

 greenish translucent intestine. 



Length of shell 0-98 "i"\ height 050 "^™, width 0-48 ™"^. 



Remarks. — This form may perhaps more properly be 

 regarded as only a variety of the preceding species. I have, 

 however, not seen any distinct transition between the two. 



