PLATE X. 



FIG. 



1. BUGULA AVICULARIA, p. 75. 



2. , dorsal surface. 



3. , nat. size. 



4. , showing the attachment of the ocecium to 



the cell. 



5. BUGULA TURBINATA, p. 77. 



6. , dorsal surface. 



7. } nat. size. 



8. , avicularium. 



