127 



A Preliminary Account of the Entomostraca of North 



Wales. 



By D. J. Scourfield. 



{Read September 20th, 1895.) 



Plate VIII.* 



The following list of fresh and brackish water Entomostraca is 

 based mainly upon the results of a personal examination of some 

 of the lakes, etc., of North Wales, principally in the Snowdon and 

 Cader Idris districts, made during two short visits at the end of 

 July and beginning of August last year and at the end of May 

 and beginning of June of the present year. I have been enabled, 

 however, to considerably increase the number of species recorded, 

 through the kindness of Prof. G. S. Brady, F.R.S., who gener- 

 ously placed at my disposal several preserved collections obtained 

 in 1888 and 1891, for which, and also for valuable assistance in 

 connection with the identification of doubtful species, I wish to 

 express my sincerest thanks. A few further species have been 

 added on the authority of records in Prof. Brady's " Monograph 

 of British Copepoda " and " Revision of the British Species of 

 Freshwater Cyclopidae and CalanidaB." 



Cladocera. 



Sida crystallina, 0. F. Miiller. This does not seem to be a 

 very abundant species in North Wales. I only have notes of its 

 occurrence in Llyn Ogwen,f Llyn Cwm-ffynnon, Llyn Creigenen, 

 and Llyn Gwernan. In each of these it was obtained by working 

 the net among clumps of horse-tails and other aquatic vegetation. 



Daphnella brachyura, Lievin. (D. Wingit, Baird, " Nat. Hist. 

 Brit. Ent.") Llyn Padarn, Llyn Peris, Llyn Cwm-ffynnon, and 

 Bala Lake are the only places where this species has been found. 



* Plate VIII. is unavoidably held over for the next number. — Ed. 



f The lakes, etc., referred to throughout this paper can be identified by 

 a reference to Baddeley and Ward's u North Wales." (Thorough Guide 

 Series. Dulau and Co.). 



