PLATE LXTX. 



KTO. 



1. Alcyonidium gelatinosuM; p. 491 ; lol)ate form, 



nat. size. 



2. , young and simple colonj'-, nat. size. 



3. , portion of surface, showing zooecial orifices. 



4. Alcyonidium parasiticum, p. 502; specimen invest- 



ing a Sertularian. 



5. , portion of crust as it appears when dried. 



6. ) a lobe, showing the arrangement of the 



cells. 



7. Alcyonidium mamillatum, p. 4-95; nat. size.^ 



8. — — , zooecia, enlarged. 



9. Alcyonidium polyoum, p. 501. After Ilassall. 



