* • 



PLATE V. 



FlCi. 



1. Brettia TUB.EFORMIS, p. 28. After a sketch by 

 Mr. R. S. Boswell. 



2-5. Cellularia Peachii^ p. 34. 



6. Flustra Barleei, p. 122, nat. size. From a drawing 



by Mr. Alder. 



7.  , zooecia, with avicularia. 



8. , zooeciaj showing the immersed ooecia. 



