t 

 6 



PLATE XXVIII. 



FIG. 



1. OBELIA DICHOTOMA, p. 156, nat. size. From a drawing 



by Mr. T. West. 



1 a. A shoot, magnified (T. H.). 1 b. A capsule, magnified 



(T. H.). 1 c, 1 (L The gonozooid. From drawings 

 by Mr. Alder. 



2. CAMPANULARIA EXIGUA, p. 172, a shoot, magnified 



(T. H.). 



2 a. The gonotheca. After Gegenbaur. 



