PLATE XVI. 



FIG. 



1. FLUSTRA FOLIACEA, p. 115; nat. size. 



1 a, 1 b. - , zooecia magnified. 



2. FLUSTRA PAPYRACEA, p. 118 ; nat. size. 



2 a. - , zooecia and ovicells. 



3. FLUSTRA SECURIFRONS, p. 120 ; nat. size. 



3 a. , zooecia, with avicularia and ovicells. 



4. FLUSTRA CARBASEA, p. 123 ; nat. size. 

 40. , zooecia. 



