and Ulvce, which look like incipient decay, are very often caused 

 by the growth of our parasite, and their colour will direct the 

 most unexamining eye to them. I have generally found the 

 plant in a perfect state in summer and autumn, but specimens 

 may be found at most seasons. 



Fig. 1. Part of a frond of Enteromorpha, infested with Myrionema stran- 

 gulans : — the natural size. 2.. A frond of the Myrionema, seen vertically. 

 3. Transverse section of the same. 4. Filaments and spores: — all more or 

 less highly magnified. 



