84 COELENTERATA—CNIDARIA SUB-BRANCH IT 
Flabellum, Lesson. (Fig. 133). Wedge-shaped, compressed, isolated, or 
attached. Septa numerous. Wall covered with epitheca, and sometimes 
furnished with spinous processes. Tertiary and Recent. 
Trochocyathus, E. and H. (Fig. 134). Horn-shaped, with circular calice. 
Septa stout; columella papillous and trabecular, and surrounded by several 
cycles of pali. Numerous species from Lias to Recent. 
Thecocyathus, KE. 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 surrounded by several 
cycles of pali. Lias, Jurassic, Cretaceous, and Recent. 
Paracyathus, Deltocyathus, E. and H. Tertiary and Recent. Discocyathus, 
E. and H. Jurassic. Coenocyathus, Acanthocyathus, Bathycyathus, BK. and H., ete. 
Tertiary and Recent. 
Caryophyllia, Stokes (Fig. 136). Turbinate, with broad base, attached. 
Calice circular; columella papillous, trabecular, and surrounded by a single 
cycle of pali. Cretaceous to Recent. 
Family 2. Oculinidae. Milne-Edwards and Haime. 
Invariably composite coralla, increasing by lateral gemmation. Walls of covallites 
thickened by a compact coenenchyma. Lower portion of visceral chamber narrowed 
or filled up by deposition of stereoplasma. Septa moderately numerous , interseptal 
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, KE. and H. Cretaceous. Astrohelia, E. 
and H. ‘Tertiary. Psammohelia, Euhelia, E. and H., 
ete. 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. 

Fic. 137. 
Enallohelia striata, Quenst. 
Coral-Rag; Nattheim. a, Natural Enalloheia, E. and H. (Fig. 137). Stock 
size; b, Calice enlarged. 5 ; ¢ ‘ 
branching ; corallites disposed usually in alternating 
sequence in two rows along the sides of branches. Coenenchyma_ highly 
developed, striated, or granulated ; columella rudimentary. Jurassic. 
Family 3. Pocilloporidae. Verrill. 
Composite, branching, lobate, or massive colonies, with small cylindrical corallites, 
united by compact coenenchyma. Septa few (6-24), sometimes rudimentary. Visceral 
chamber partitioned off by horizontal tabulae. 
Of the two recent genera belonging to this family, Pocillopora and Seriato- 
pora, Lam., the former occurs also fossil in the Tertiary. 
