126 SPOLIA ZEYLANICA. 
ON TWO NEW ENTOMOSTRACA FROM CEYLON. 
BY 
ROBERT GURNEY. 
With two Plates. 
Te aaie aera as survey of our knowledge of the freshwater 
Entomostraca of Ceylon was published in 1898 by Daday, 
and since then nothing has been added to it so far as I am aware. 
Combining the species recorded for the first time in his paper with 
those previously described by Brady (1886) and Poppe and Mrazek 
(1895), he gives a list containing one Phyllopod, twelve Copepoda, 
and thirty-six Cladocera. Thanks to the papers of Sars, Stingelin, 
and Richard, we have a list of Entomostraca from the Indo-Malayan 
sub-region comprising two Phyllopoda, forty-six Cladocera, and six 
Copepoda, but practically nothing is known at present with regard 
to India. We are also far from having a complete knowledge of 
the Entomostraca of the Ethiopian and Australian regions, so that 
at present the facts at our disposal are too limited to allow of satis- 
factory deductions being made with regard to geographical distri- 
bution. The difficulty is also much increased by the fact that many 
genera and some species have a world-wide distribution, and appear 
to be independent of barriers, which hinder the disposal of other 
forms. Whether this is due to an extreme adaptability, or indicates 
a distinction between primitive widely distributed forms and 
those of more recent origin (Moore, 1903), it is difficult to say. 
However, so far as the facts go it may be useful to summarize them. 
Taking the Cladocera as being the most numerous and best known 
group, we find that of the thirty-six species and varieties recorded 
from Ceylon thirteen are peculiar to it, so far as is known at present. 
The following are the numbers of species and varieties common to 
Ceylon and the various Zoogeographical Regions :— 
Palearctic se es 10 
Nearctic Rae ee 3 - 4 
Neotropical Pe bn oe 8 
Ethiopian ne af se 5 
Australian - oe seni Ws ak 
Indo-Malayan Sub-region ~ “i nS 18 

