414 



THE ZOOLOGIST. 



Hertfordshire Natural History Society,' vol. xv., Hertford, 1914, 

 pp. 127-136, Mr. Edward Popple records the occurrence of a 

 comparatively large number of species of Entomostraca. About 

 forty of these are recorded for parts of the country about Berk- 

 hamsted, Hemel Hempsted, and Chipperiield. Some of the 

 records above referred to will be mentioned when describing the 



Fig. 22. 



Fig. 21. 



various species in the following notes, which, like those on the 

 Eotifera, will commence with some of the common species. 



1. Cyclops serrulatus, Fischer. — Of all the Copepoda of the 

 country of the Chess and Gade this is the commonest. Not only 

 have specimens been obtained from almost every pool and from 

 many parts of the canal, the Chess, and the Gade, but they have 

 been obtained at all seasons of the year. My rough notes con- 

 tain so many accounts of collections of specimens of this species 

 that it seems best to give the general conclusions which may 

 be drawn from them, limiting the detailed references to those 



