90 



COELENTERATA ANTHOZOA 



SUB-BRANCH II 



Astrocoenia, E. and H. (Fig. 157). Massive colonies. Corallites polygonal, 

 united by their walls; septa numerous, long. Columella stylif orm ; only 



dissepiments present in visceral 

 chamber. Trias to Tertiary. 



Stephanocoenia, E. and H. 

 Like the preceding, but with 

 columella surrounded by cycle of 

 pali. Trias to Recent. 



Phyllocoenia, E. and H. (Con- 

 fusastraea, d'Orb. ; Adelastraea, 



FIG. 157. Reuss). Massive colonies. Coral- 



lites round or oval, imperfectly 

 united by costae. Septa strongly 

 developed, thickened in the middle between theca and the centre. Columella 

 rudimentary. Trias to Tertiary. 



Convexastraea, d'Orb. ; Trias to Cretaceous. Colnmnastraea, Stylocoenia, E. 

 and H., etc. ; Cretaceous and Tertiary. 



y. Coralla multiplying by fission. 



Haplosmilia, d'Orb. Bushy colonies. Corallites usually with tlichotomously 

 dividing crests. Calices circular or elongated ; columella styliform ; theca with 

 ridge-like costae. Jurassic. 



Plocophyllia, Reuss (Fig. 158). Branching, foliaceous, or massive colonies. 



Astrocoenici decaphylla, E. and H. Upper Cretaceous ; Gosau 

 Valley, Austria, a, Coralluin, natural size ; I, Calices enlarged. 



FIG. 158. 



Plocophyllia (xdyculata, Reuss. Oligocene ; Monte 

 Carlotta, near Vicenza. Natural size. 



FIG. 150. 



I!li!)iiili> ; /!ira crassa, From. Coral - Rag ; Gray, 

 Haute-Saone. i/a natural size. 



Corallites either becoming free or grouped into detached rows. Columella 

 absent. Tertiary. 



BarysmUia, E. and H. Corallum massive, forming a thick stem, the apex 

 of which is covered with short buds. Calices oval, sometimes disposed in 

 series ; columella rudimentary. Cretaceous. 



Stenosmilia, From. Like the preceding, but with lamellar columella. 

 Cretaceous. 



Pachygym, E. and H. Corallites arranged in winding rows, and united by 



