PLATE LXX. 



Fin. 



1. Alcyonidium uisjunctum, p. 497 ; portion of the 

 crust, enlarged. 



2,3. Alcyonidium mytili, p. 498; zocecia. 



4. Alcyonidium hirsutum, p. 493 ; young colony, 

 nat. size. 



5. , portion of surface, viewed from above, 



showing the zooecial orifices surrounded by the 

 papillse. 



6. , papillse, viewed in profile. 



7. , the polypide. 



8, 9. Alcyonidium albidum, p. 500 ; portions of crust. 



10. '■ , two zorecia detached. 



11, 12. , polypides. 



