THE HISTORY OF THIS WORK. Vll 



Hyalosphenia elegans and Nebela carinata, both being 

 species which are described in this volume. Their 

 names on the plate are as written in pencil by him. 



The work was accepted by the Council, subject to a 

 satisfactory estimate being obtained for the reproduc- 

 tion of the plates, and this being submitted it was 

 definitely accepted at a Council meeting held on 26th 

 March, 1903, the idea then being to bring it out as a 

 single volume for the year 1905. It was subsequently 

 decided (12th May, 1904) to divide it into three 

 volumes, each of less extent than the one would have 

 been, while the whole would be of considerably greater 

 extent than was at first anticipated. It was also 

 decided that each volume should appear for the same 

 year as a larger botanical volume, following the plan 

 adopted with the first volume of the ' British Tunicata.' 

 For this arrangement there were two reasons : (1) It 

 was found that so much had to be done that only a 

 portion of the work could be brought out within a 

 reasonable time, and that it could more conveniently 

 be divided into three than into two volumes ; and (2) 

 that as nearly all our personal subscribers are zoolo- 

 gists, it w T ould not be advisable to give to them for 

 their year's subscription a botanical work only, the 

 division of the monograph into three volumes meeting 

 our requirements in this respect for some years. 



Mr. Cash was then living at Northenden, Cheshire, 

 and had not the opportunity of consulting many books 

 on the subject of his monograph. He was consequently 

 acquainted with only a small portion of the literature 

 relating to the Freshwater Rhizopoda which had been 

 produced in recent years, in Germany especially, and 

 I found that several of his drawings which were either 

 un-named or considered by him to be new species, repre- 



