PREFACE. 



IN the preparation of the third volume of this work 

 on British Freshwater Rhizopoda, unfortunately left 

 unfinished by the late James Cash, the descriptions in 

 his MS., kindly placed at my disposal, have been 

 utilized so far as possible ; his note-books have been 

 searched for records of localities, which are given 

 with his name appended ; and such of his drawings as 

 were suitable have been reproduced. Several draw- 

 ings kindly supplied by Prof. G. S. West are also 

 given, and in a few instances the published figures of 

 species by their authors are reproduced ; the remain- 

 ing drawings were made by myself from either living 

 or mounted specimens. 



In the time at my disposal it was not possible to 

 obtain records from all parts of the British Isles, but 

 owing to the kindness of friends much material was 

 examined from districts which I was unable to visit. 

 In some cases the gatherings of sphagnum and moss 

 and the squeezings were numerous and representative 

 of considerable areas, and my thanks for such are 

 especially due to the following : the late William West, 

 from whom were received about forty tubes of material 

 from the north of Scotland, the Hebrides, the Orkneys, 

 and the Shetland Islands, also about twenty tubes of 

 material collected in the Scilly Islands, Cornwall, 

 Devonshire, and the New Forest; James Saunders, 



