-^^' Plate VII. 



K 1. Sertularia pumila, nat. size. 1a, Calyclesand gono- 

 phore enlarged, p. 112. 

 J}f^ 2. Sertularia argentea, nat. size. 2a, Calycles enlarged, 



^^ p. 115. 



«■ 3. Sertularia operculata, nat. size. 3a, Calycles eu- 

 1 ' larged, p. 113. 



