Plate XVII; Figures 99 to 105; Magnified iooo 



Diameters. 



Cpsmarium Broomei Thwaites 

 tumidum Fund. 



' 1?) 

 Pleurotcenium sp. (?) 

 Cosmarium ornatum Ralfs 

 Pleurotcenium Baculum Breb. 

 Euastrum vemicosum ( Ehrb. ) Ralfs 

 integrum Wolle 



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62 



