468 Miss Edith M. Pratt on the 



object of noting the principal differences that presented them- 

 selves in the early spring and in the autumn. 



Accordingly in April 1897, when the weather was still 

 very cold and blasts of icy wind blew down in gusts from the 

 snow-capped Skiddaw, I took a few samples of the Plankton 

 as a preliminary step to further investigations. The material 

 I then obtained proved to be of considerable interest, con- 

 taining among other things the interesting NaupUus larva of 

 Leptodoi-a. 



Jn April of this year, the weather being decidedly warmer 

 than in the corresponding time of 1897, I obtained the assist- 

 ance of Mr. J. T. Wadsworth, and made with him a con- 

 siderable number of gatherings in various parts of the Lake, 

 so that it may be said that we obtained a fair sample of what 

 the Plankton is at that time of year. 



Again, in June, with the assistance of Mr. J. H. Ash- 

 worth, B.Sc, another long series of tow-nettings were taken 

 which show the remarkable 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. Ashwoith 

 and Mr. Wadsworth for their skilled assistance in this inves- 

 tigation. 



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 investigation. 



It is well known to fishermen that the lakes in Cumber- 

 land vary very considerably in their "trout" reputation. 

 Bassenthwaite is not regarded as a very good lake for trout, 

 but, on the other hand, it contains an abundance of perch and 

 pike. It would be extremely interesting if in time a syste- 

 matic 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 labora- 

 tory 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. 



