LUCERNARID.E. 369 



tremulous undulations ; but the vesicles appeared to 

 me to be air-vessels placed along the edges of the 



Fig. 195. Zoophytes. 



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

 polypes protruding and tentacles expanded, others closed. 4, Xanthidia, in 

 flint. 5, Madrepore Abrotanoide. 6, Madrepore, cell magnified showing in- 

 ternal structure. 7, Corallidce ; Coral. 8, Coral, polypes magnified and pro- 

 truding from the cells. 9, Gorgonia nobilis, polypes magnified and expanded. 

 10, Tubipora musica, polypes protruded. 11, A tube of same, with polype 

 expanded, and one cut longitudinally to show its internal structure. 12, 

 Sertularia, polypes protruded ; and others withdrawn into their cells. 

 B B 



