Fresh-Water Entomostraca from China and Sumatra. 33 



Length of shell 0-57 ^^^^ height 0-39 '""^ width 026 '""'. 



Remarks. — The ahove-described form miquestionably 

 belongs to the genus Cijpria of Zencker, and is chiefly dis- 

 tinguished from the other known species of this genus by 

 the distinctly tuberculated anterior edge of the right valve 

 and by the want of anj^ pigmentary dots on the shell. 



Occurrence. — Some few specimens of this form were 

 picked up from the sample taken by Mr. Iversen at the 

 Helvetic Estate, Sumatra. Among them was also a male 

 specimen easily recognizable as such by the large trans- 

 lucent ejaculatory apparatus, but exactl}^ agreeing with the 

 female in the shape of the shell. 



10. Piouocypris turgida, G. O. Sars. 



Occurrence. — This form developed rather abundantlj'^ 

 both in the aquaria prepared with mud from Sumatra and 

 in those prepared with mud from China. 



Distribution. — New Zealand, Australia, Madagaskar. 



11. Cypridopsis vidua (Müller). 



Occurrence. — In one of my aquaria prepared with mud 

 from China, a Cypridopsis, undistinguishable from the com- 

 mon European species, was found in considerable numbers. 



Distribution. — Europe, North America. 



12. Cypridopsis exigua, G. O. Sars, n. sp. 



(PI. IV, figs. 3, 3a-b). 



Specific Characters. — Female. Shell very tumid, 

 seen laterally, rounded triangular in form, greatest height 

 considerably exceeding | of the length and occurring in 



