'34 



THE PHYTOPLANKTON OF THE ENGLISH 

 LAKE DISTRICT. 



Wm. west, F.L.S., 



AND 



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



{Continiied from page 122). 



14. Codale Tarn, Westmorland. June 1903. Altit. 1528 feet. 

 A small mountain tarn receiving the drainage from parts of 

 Tarn Crag (1801 feet) and High White Stones (2374 feet). The 

 plankton contained various filamentous Chlorophyceae, such as 

 Microspora ahbreviata and species of Moitgeotia. Washed in 

 from the shores of the tarn were filaments of Binucleara tatrana, 

 fragments of Stigonema minutum, and a few filaments of Ham- 

 matoidea Normanii. Numerous Desmids were present, among 

 which should be mentioned Cosmarium ornatum, C. hioculatum 

 Arthrodesmus Incus, Staurastrum anatinum, and Gymnozyga 

 moniliformis. The most abundant Diatom was Tahellaria 

 flocailosa, and long ribbons of Ennotia pcctinalis were frequent. 

 Peridimum Willei was again much in evidence. 



15. Easedale Tarn, Westmorland. May 1903. Altit. 915 feet. 

 A small lake, about a third of a mile in length, with rocky 

 shores. The dominant features of the plankton were numerous 



Fig. I. A. and B. — Filaments of Moitgeotia sp. from the plankton of 

 Easedale Tarn (X2oo), showing a curious anastomosis which may be due 

 to aborted conjugation. C. and D., Coiled filaments of Moitgeotia sp., 

 from the plankton of Grasmere ( x 200). D. consists of one cell only. 



Naturalist, 



