PREFACE. 
In the present volume are described those species 
of Rhizopoda which belong to the genera treated in 
Volumes I and IL and had not been recorded from 
the British Isles when those volumes were published, 
also such British species as have since then been first 
described. 
Since the death of Mr. Cash in 1909 very few 
records of Rhizopoda occurring in the British Isles 
have been published except those by Mr. J. M. Brown 
and myself; from these this volume of supplementary 
species and varieties is compiled. 
Owing to my absence abroad, and occupation on 
work connected with the war during the last three 
years, my own records consist almost entirely of those 
obtained from the gatherings made by myself or sent 
to me by friends ‘which are acknowledged in the 
preface to Vol. III. From these gatherings also 
were obtained numerous records of localities in which 
occur most of the Conchulina and many of the 
Amoebina described by Cash, thus sufficing to show 
that the majority of the species described in Vols. I 
and II are generally distributed over the British Isles 
wherever the habitat is suitable, 
