ON ENTOMOSTRACA PROM CEYLON. 333 



9. On some Fresh-water Entomostraca from Ceylon. 

 By Robert Uurnfa', M.A., F.Z.S. 



[Received February 8, 1916 : Read April 4, 1916.] 

 (Plates I.-III.* and Text -figure 1.) 



Index. 



Geographical; Page 



An African genus {Oticocypris) in Ceylon 340 



Systematic : 



Diaptomus viduus, sp. ii 338 



Onnoci/pris pustulosa, s'p. n 340 



Pl/ffsoci/pria tubcrata, sj). n 341 



The fresli-water Entomostraca of which an account is given 

 here were collected by Mr. G. W. Smith during a visit to Ceylon 

 in September and October, 1907, on his return from Tasmania, 

 and I desire to express my thanks to him for his kindness in 

 handing them over to me for examination. The collections 

 were made in A^arious waters at Colombo, Kandy, Peradeniya, 

 Mahintele, and Anuradhpura, but I have not thought it 

 necessary in most cases to specify precisely in what spot a 

 particular species was found. 



The most complete account that has been published of the 

 Entomosti'aca of Ceylon is that given by Daday in 1898 ; but 

 there have been several other contributions made to our know- 

 ledge of them, so that we now know of 94 species or well-marked 

 varieties inhabiting Ceylon. Mr. Smith's collections contain 

 35 sjDecies, of which three are, as I believe, hitherto midescribed, 

 and several are additions to the list. It is rather remarkable 

 that, of the four species of Diaptoimcs here recorded, three have 

 not before been taken in Ceylon, and it is quite evident that the 

 fresh-water Entomostraca of Ceylon are very far from being 

 completely known. 



I. PHYLLOPODA. 



Cyclestheria hislopi Baird. 



Nine specimens, some with developing young in the brood- 

 pouch, were taken in the Colombo water-supply. 



II. CLADOCERA. 



DiAPHANOSOMA EXCISUM SarS. 



A considerable number of specimens of a species of Biaphano- 

 soma were found in a tank at Kandy by Lady Horton's Drive and 

 also in Colombo Lake, while a few were taken at Anuradhpura. 



* For explanation of the Plates see p. 343. 



