VI PEEFACE. 



for nearly all the records for Bedfordshire, from 

 material collected by him in the Luton district; W. S. 

 Pring for material collected in the Isle of Wight; 

 H. B. Forrest and the Rev. W. S. Ingrams for the 

 Shropshire records, from material collected in the 

 Shrewsbury district; John Hopkinson, James Saun- 

 ders, H. E. Forrest, and H. Leigh for material from 

 North Wales ; N. Simpson, from Cambridgeshire ; 

 R. Wetherell, from Nottinghamshire and Rutland- 

 shire ; N. Chadwick, from the Isle of Man ; H. Powell, 

 from Dumfriesshire ; and H. F. Wailes, the Rev. F. 

 Johnson, and L. Bayley, for material from Ireland. 

 In addition to these I am indebted to several friends 

 for contributions of moss, etc., from other localities. 

 The various published lists of Freshwater Rhizopoda 

 found in the north of England and Scotland by J. M. 

 Brown and Gr. S. West have also materially helped to 

 increase the number of records. 



Much more, however, still remains to be done before 

 we can gain any correct idea of the distribution of 

 the Freshwater Rhizopoda throughout the British 

 Isles, and it is hoped that the objects for which the 

 Ray Society was founded will be furthered by many 

 microscopists making records of the Rhizopodal fauna 

 of the districts in which they reside, and that these 

 volumes will prove an aid and incentive to them in 

 the task. 



Since 1909 records of about forty species have been 

 added to the genera described by Cash in Vols. I and 

 II; these it is proposed to include in a fourth and 

 final volume of this work. 



Of the species described in those volumes the occur- 

 rence of Amoeba pilosa in New York State and of 

 Nebela bipes in the plankton of a small lake on Achill 



