ALGM. 



157 



Animal Desmids? 



The species of Closterium are amongst the largest 

 and most beautiful of the Desmids (Fig. 27). They 

 are often distinctly visible to the naked eye, of a 



Wk 



Fig. i-j.—Closierhnn Stiiolatum; Closterium Leib.'einii- 



beautiful green colour when living, and flourish in the 

 clear water of ditches, streams, and bogpools. In 

 form they are always elongated, more or less curved, 



