THE PHYTOPLANKTON OF THE ENGLISH 

 LAKE DISTRICT. 



Wm. west, F.L.S., 



AND 



G. S. WEST, M.A., D.Sc, F.L.S., 



[Contimced from page 2^2). 

 Flagellata. 



23. Mallomoxas longiseta Lemm. in Arkiv for Botanik 

 utgifv. af K. Sv. Vet.-Akad. Bd. 2, No. 2, 1904, p. 118. 



This Flagellate was observed in Brothers' Water, Easedale 

 Tarn, and Windermere ; and in the first-mentioned lake it was 



\ \ 



Fig. 7. A., Dinobryon cylindvicum Imhof, from the plankton of Crum- 

 mock Water, showing three resting spores ; B., D. cylindvicum var. 

 divevgens (Imhof) Lemm., from the plankton of Derwent Water ; C. and D., 

 D. cvenulatum sp. n., from the plankton of Ennerdale Water. All x 500. 



the dominant constituent of the September plankton. Long, 

 cell, 29.5-37//; lat. cell, 17-21. 5 /x ; long, spin., 54-62 /v.. 

 It is known in the plankton of the Scottish lakes, but this is 

 the first English record. The spiny covering is particularly 

 conspicuous in this species, and the cell possesses a single 

 brown parietal chromatophore and one flagellum. 



1909 Sep. I 



