PLATE X. 



FIO. 



1. BUGULA AVICULARIA, p. 75. 



2. , dorsal svirface, 



3. , nat. size. 



4. , showing the attachment of the ooecium to 



the cell. 



5. BuGULA TURBINATA, p. 77. 



6. , dorsal surface. 



7. , nat. size. 



8. , aviculariimi. 



