'34 



THE PHYTOPLANKTON OF THE ENGLISH 

 LAKE DISTRICT. 



Wm. west, F.L.S., 



AND 



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



{ContiniLed 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 ahhreviata and species of Mougeotia. 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. hiocttlatum 

 Arthrodesmus Incus, Staurastrum anatinum, and Gymnozyga 

 moniliformis. The most abundant Diatom was Tabellaria 

 flocculosa, and long ribbons of Eunotia pectinalis were frequent. 

 Peridinium 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 Mougeotia sp. from tiie plankton of 

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

 to aborted conjugation. C. and D., Coiled filaments of Mougeotia ^;p., 

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



Naturalist, 



