ARCHIV FOR MATHEMATIK OG NÄTÜRYIDENSKAB. B. XXV. Nr. 8. 



FRESHWATER ENTOMOSTRACA FROM CHINA 

 AND SUMATRA 



By 

 G. O. SARS 



WITH 4 AUTOGRAPHIC PLATES 



INTRODUCTION. 



The far greater number of the species recorded in this 

 paper have been raised by the present author, many years 

 ago, from dried mud, and accordingly have been examined 

 in the Uving state, in most cases, moreover, during several 

 successive generations. Some few additional forms have been 

 picked up from a sample preserved in alcohol and taken by 

 Mr. Iversen, preparator (at that time) off the zoological Mu- 

 seum, during his stay in the north-eastern part of Sumatra 

 (territories of Deli and Langkat) in the year 1888. I am also 

 indebted to him for a parcel of dried mud taken from 

 some swamps in the same part of the country. Several 

 interesting forms, to be mentioned in the present paper, 

 have been reared in my aquaria from this mud during the 

 summers of 1889 and 1890. The dried material from China 

 consisted of several small parcels of a reddish clay taken 

 partly from fish-ponds, partly from inundated rice-fields in 

 the neighbourhood of Puching. From this material also, 



