SUBCLASS II 



HEXACORALLA 



95 



Thecocyathus E. and H. Depressed, conical, or discoidal, attached early in 

 life, later becoming free. Wall with thick epithecal investment. Calice 

 circular, septa numerous ; columella fasciculate, and sur- 

 rounded by several cycles of pali. Lias, Jurassic, Cre- 

 taceous, and Recent. 



Faracyathus, Deltocyathus E. and H. (Fig. 134). 

 Tertiary and Recent. Discocyathus E. and H. Jurassic. 

 CoenocyatJms, Acanthocyathus, Bathycyathus E. and H., etc. 

 Tertiary and Recent. 



Caryophyllia Lam. (Fig. 135). Turbinate, with broad 



Fig. 133. 



Trochocyathus conulus From. ^ Aptian ; 

 Haute Marne. a, Profile, natural size ; li, 

 Calice enlarged. 



Fig. 13-i. 

 Deltocyathus italicus B. and H. Miocene ; 



Fig. 135. 



Caryophyllia cyathus 

 Sol. Recent. Longitudi 



Porzteicli, Moravia, a, Profile, natural nal section, natural size 



size ; h, Calice enlarged. 



(after Milne Edwards). 



base, attached. Calice, circular ; columella papillous, trabecular, and sur- 

 rounded by a single cycle of pali. Cretaceous to Recent. 



Family 2. Oculinidae Milne Edwards and Haime. 



Invariably composite corolla, increasing by lateral gemmation. Walls ofcorallites 

 thickened by a compact coenenchyma. Lower portion of visceral chamber narrowed or 

 filled up by deposition of stereoplasma. Septa moderately numerous ; hderseptal loculi 

 usually open to the base. Lias to Recent ; fossil forms not particularly numerous. 



Oculina Lam. Corallites irregularly or spirally distributed over the smooth 

 surface of coenenchyma. Septa slightly projecting ; columella papillous, 

 surrounded by cycle of pali. Tertiary and Recent. 



Agathelia Reuss. Like the preceding, but form- 

 ing tuberous or lobate colonies. Cretaceous and 

 Tertiary. 



Synhelia E. and H. Cretaceous. Astrohelia E. 

 and H. Tertiary. Psammohelia, Euhelia E. and H., 

 etc. Jurassic. 



Haplohelia Reuss. Small, arborescent, with 

 corallites all disposed on one side of the branches. 

 Coenenchyma striated or granulated. Septa in 

 three cycles ; columella and pali present. Oligocene. 



Enallhelia E. and H. (Fig. 136). Stock branch- 

 ing ; corallites disposed usually in alternating 

 sequence in two rows along the sides of branches. 



Coenenchyma highly developed, striated, or granulated ; columella rudi 

 mentary. Jurassic. Tyj^e, E, Compressa (d'Orb.). 



Fig. 136. 



Enallhelia striata Quenst. Coral- 

 Rag ; Nattheim. a, Natural size ; 

 6, Calice enlarged. 



