PLATE LX1X. 



Fin. 



1. ALCYONIDIUM GELATINOSUM, p. 491 ; lobate form, 



nat. size. 



2. - , young and simple colony, 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. 495 ; nat. size. 



8. - , zocecia, enlarged. 



9. ALCYONIDIUM POLYOUM, p. 501. After Hassall. 



