ZOOPHYTA HELIANTHOIDA. 



205 



Family I. MADREPHYLLIiEA. 

 Body cased icith a solid calcareous cupped polypidom, lamel- 



lated internally. 



17. TuRBiNOLiA. Polypidom turbinate, becoming free by age. 



18. Caryophyllia. Polypidom cylindrical, always attached. 



Family II. ACTINIID^. 



Body naked^Jleshy, contractile^ locomotive. 



19. Actinia. Body conoid or cylindrical ; the tentacula retractile. 



20. Anthea. Body cylindrical ; the tentacula non-retractile. 



21. Lucernaria. Body somewhat campanulate ; the tentacula 

 in tufts disposed at distant intervals round the margin. 



Fig. 29. 



Actinia viduata. 



