164 SEAWEEDS 
and Anadyomene, not in special zoosporangia but in 
any of the ordinary thallus cells. The zoospores are 
bi-ciliated, with a hyaline anterior end and a red spot. 
Nothing is known of their further history. 
In Valonia ventricosa (Fig. 46) there arise by free 
cell-formation a large number of spores with cell- 
Fic. 49.—Boodlea coucta. u, thallus filaments; b, two haptera highly 
magnified. 
membranes. They do not all arise simultaneously, 
since in some specimens comparatively few spores 
are to be found, while a considerable amount of 
free protoplasm remains; in others again the spores 
are very numerous and the amount of unused 
protoplasm isa mere trace. Somewhat similar spores 
