ACTINIA. 



485 



Teasels placed along the edges of the folds, and the vesi- 

 cles disappeared when the animal was touched." 



Fig. 237 



1. Fungia agariciformis. 2, Alcyonium, Cydonium Mulleri. 3, 



polypes protruding and tentacles expanded, others closed. 4, Zoantharit^ 

 viewed from above. 5, Madrepore, Abrotanoidc. 6, Madrepore, cell slightly 

 magnified, showing internal structure. 7, Corattidce; Corah 8, Coral, polypes 

 protruding from the cells. 9, Gorgonia nobttis, polypes expanded. 10, Tubi- 

 pora musica. 11, a tube of same, with polype expanded, and one cut longi- 

 tudinally to show internal structure. 12, Scrtularia, polypes protruded ; and 

 others withdrawn into polypidoms. 



