Fresch-Watei- Entomastraca from China and Sumatra. 19 



form been observed by any other zoologists. It is a very 

 distinct species, being especially highly distinguished by 

 the peculiar spiniform dorsal protuberance of the penulti- 

 mate segment of the metasome in the female. 



Occurrence. — Some specimens of this form developed 

 in one of my aquaria prepared with mud from China, and 

 were watched for several time. They w^ere extremelj^ rapid 

 in their movements, so as only with great difficulty to be 

 catched by the ordinary implements. 



Distributio n. — Mongolia {Richard). 



FAM. CYCLOPID>æ. 



3. Cyclops Leuckarti, Claus. 



Occurrence. — This form occurred rather abundantly 

 in the sample taken by Mr. Iversen at the Helvetic Estate, 

 Sumatra. I have carefully compared it with Norwegian 

 specimens and can find no difference whatever. 



Distribution. — Europe, Central Asia, Ceylon, Algeria, 

 Australia, North America. 



4. Cyclops liyalinus, Rehberg. 



Remarks. — -Dr. Schmeil regards this form as only a 

 variety of C. oithonoides G. O. Sars. In this view I am by 

 no means prepared to consent. It seems to me to be in 

 reality a well defined species. 



Occurrence. — Found together with the preceding 

 species, but not nearly in such numbers. 



Distribution. — Europe, Cape of Good Hope (coll. of 

 Dr. Par cell). 



