124 EDITH M. PRATT, B.SC. 



Again, in June, with the assistance of Mr. J. H. Ashworth, B.Sc, 

 another long series of tow-nettings were taken which show the remark- 

 able change that takes place in the character of the Plankton during 

 the first two months of the summer. 



I have to acknowledge here my thanks to Mr. Ashworth and Mr. 

 Wadsworth for their skilled assistance in this investigation. 



As my time was fully occupied during the summer months I 

 entrusted the duty of identifying the species to my former pupil, Miss 

 Edith Pratt, B.Sc, of the Owens College ; and the results of her 

 investigations are recorded below. 



It cannot be supposed that the list of Entomostraca which is now 

 given as occurring in Lake Bassenthwaite is by any means complete. 

 A complete list will be drawn up only when a series of gatherings are 

 taken every month for two or three years ; but it may be hoped that 

 the publication of this paper will act as a stimulus for further investi- 

 gation. 



It is well known to fishermen that the lakes in Cumberland vary 

 very considerably in their "trout" reputation. Bassenthwaite is not 

 regarded as a very good lake for trout, but, on the other hand, it con- 

 tains an abundance of perch and pike. It would be extremely 

 interesting if in time a systematic study of the relations between the 

 fish-fauna and the Entomostracan fauna could be undertaken. It 

 would not be a very costly investigation, but it would require the whole 

 time of a competent naturalist provided with a modest laboratory on 

 the lake side for a period of two or three years. The results to be 

 obtained might be of considerable value to the fishery. — S. J. H. 



Bassenthwaite Lake is particularly well suited for faunistic investi- 

 gations, for while being one of the lowest of the English lakes, it 

 has the largest drainage-area ; it also receives the overflow from 

 Derwentwater and Thirlmere ; therefore in Bassenthwaite we should 

 expect to find a typical lake-fauna, and, in addition, a concentration of 

 the forms living within the drainage-area of the lake. 



Bassenthwaite 1 is the same size as Derwentwater — a little over 



1 For a complete description of Lake Bassenthwaite see ' Bathymetrical 

 of the English Lakes,' by H. R. Mill, D.Sc. 



