PREFACE. Vll 



Island, Mayo, are of interest; and in this connection 

 it may be remarked that with the exception of Loch 

 Ness not one of the British lakes has been investi- 

 gated as to the Rhizopodal fauna of either the plankton 

 or deposits, a large and un worked field awaiting in- 

 vestigation. 



Our present records suffice, however, to show that 

 the Rhizopodal fauna of the British Isles as a whole 

 resembles that of Continental Europe with the excep- 

 tion of the occurrence of some species more or less 

 characteristic of the North American fauna; they 

 consist of the following : Arcella mitrata, Nebela equi- 

 calceus, N. caudata, N. barbata, Euglypha cristata var. 

 major, E. brachiata, and Sphenoderia macrolepis. 

 These do not occur abundantly, and their distribution 

 appears to be confined to Ireland and the western 

 portions of Great Britain ; they are either common or 

 not very rare in the United States, but, excepting the 

 two first-named, are unrecorded from Continental 

 Europe. 



In conclusion I have to thank Dr. Eugene Penard 

 for his invariable and ready assistance, and Mr. John 

 Hopkinson for his bibliographical work, nearly all the 

 synonymic references being his, and also for the final 

 preparation of my MS. for the press, a labour which 

 devolved upon him owing to my absence from England. 



G, H. WAILES. 



VANCOUVER, B.C., 



2Uh July, 1915. 



