Fresh-Water Entomostraca from China and Sumatra. 13 



10. Macrothrix spiiiosa, King. 



Occurrence. — This form, previously raised by the 

 present author from Australian mud, developed in cons- 

 iderable numbers in the aquaria prepared with mud from 

 Sumatra. It was also found not unfrequently in the sample 

 taken by Mr. Iversen. 



Distributio n. — Australia. 



11. Ilyocryptus sordidus (Lièvin). 



Occurrence. — At the bottom of some of my aquaria 

 prepared with mud from China an Ilyocryptus of a dark 

 blood-red colour was found, dragging itself slowly through 

 the bottom-deposit, and never making even the slightest 

 attempt to swim. On a closer examination of the specimens, 

 I am unable to distinguish this form from the European 

 species first described by Lièvin as Acanthocercus sordidus. 



Distribution. — Europe, Australia, Brazil. 



12. Ilyocryptus longiremis, G. O. Sars. 



Occurrence. — This form, first described by the present 

 author from Australia, developed rather abundantly in the 

 aquaria prepared with mud from Sumatra, and was also 

 found not unfrequently in the sample taken by Air. Iversen. 



Distributio n. — Australia, Brazil. 



FAM. CHYDORIDÆi. 



13. Chydorus spliæricus (Müller). 



Occurrence. — Found both in the aquaria prepared 

 with mud from China and Sumatra, as also in the sample 

 from the last-mentioned country. 



Distribution. — Allmost all the world. 



