ZOOPHYTA HELIANTHOIDA. 
205 
Family I. MADREPHYI.LIiEA. 
Body cased with 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, fleshy , contractile , locomotive. 
19. Actinia. Body conoid or cylindrical ; the tentacula retractile. 
20. Anthea. Body cylindrical ; the tentacula pon-retractile. 
21. Lucernaria. Body somewhat campanulate ; the tentacula 
in tufts disposed at distant intervals round the margin. 
Fig. 29 
Actinia viduata 
