71 



AN ALONA AND A PLEUROXUS NEW TO BRITAIN 

 (4. WELTNERl KEILHACK, AND P. DENTICULATUS 

 BIRGE.) 



By D. J. Scourfield, F.Z.S., F.R.M.S. 

 (JRead March l~,tJt, 1907.) 



Plate 8. 



Since the publication of Part I. of my " Synopsis of the Known 

 Species of British Fresh-water Entomostraca," in April, 1903 (see 

 Journ. Q. M. C, vol. 8, p. 431), there have only been, so far as 

 I know, three published records of species of Cladocera new to 

 Britain — namely, Scapholeberis aurita, Ophryoxus gracilis, and 

 Alonopsis ambigua. 



The first-named was found by Mr. It. Gurney in Norfolk, and 

 recorded by him in the Annals and Magazine of Natural History 

 (vol xii., 1903, p. 630). It was duly noted as British in an 

 appendix to Part III. of the " Synopsis " {Journ. Q. M. C, 

 vol. 9, 1904, p. 40). The second I obtained from Loch Ness, and 

 placed on record in the appendix just referred to (p. 41). The 

 third was discovered by Mr. R. Gurney, again in Norfolk, and 

 recorded in the Transactions of the Xorfolk and Norwich 

 Naturalists 1 Society, vol. viii., 1905, p. 59. All three species are 

 figured and described in Lilljeborg's Cladocera Sueciae, the work 

 which was taken as the basis of the " Synopsis " so far as the 

 Cladocera were concerned. 



I am now able to add two further species to our list, and as 

 neither is mentioned by Lilljeborg, figures and descriptions of 

 them will be given, in order to continue the plan of supple- 



