94 COELENTERATA—ANTHOZOA SUB-BRANCH II 
Genabacia, E. and H. Like the preceding but composite, the central calice 
being surrounded by a row of smaller calices. Jurassic. 
Micrabacia, E. and H. Cretaceous. 
Omphalophyllia, Laube. Simple, turbinate, or sub-cylindrical, attached, and 
covered with epitheca. Septa very numerous, upper edges granulated. Calice 
shallow, columella styliform. Alpine Trias. 
Cyclolites, Lam. (Fig. 166). Simple, free, discoidal, upper side vaulted, 
lower flat‘and covered with corrugated epitheca. Septa very thin, extending 

Fic. 167. 
Thamnastraea prolifera, Becker. Upper Jurassic; Nattheim, Wirttemberg. A, Corallum, 2/3 natural size ; 
w, Common wall. £L, Lateral surface of costal septum, enlarged (8/;), showing trabecular constitution ; m, Line 
of junction of two septa belonging to different corallites; ¢, Trabeculae ; p, Trabecular lacunae (after Pratz). 
C, Thamnastraea agaricites, Goldf. Upper Cretaceous; Gosau, Salzkammergut. Portion of upper surface of 
corallum, natural size. 
to the centre, extremely numerous, composed of vertical rows of trabeculae, and 
united by synapticulae and dissepiments. Very abundant in Cretaceous, rare 
in Jurassic and Eocene. 
Thamnastraea, Le Sauvage (Fig. 167). Composite, laterally expanded and 
pedunculate, or mushroom-shaped coralla. Common wall restricted to lower 
side of corallum ; individual corallites without 
proper walls, but united by costal septa. 
Columella stylitorm or rudimentary. Septa 
well developed, composed of fan-shaped rows 
of cylindrical trabeculae, and united by synap- 
ticulae and dissepiments. Very abundant 
from Trias to Oligocene. 
Dimorphastraea, VOrb. Like the preced- 
ing, but with calices concentrically arranged 
about a central individual. Trias to Tertiary. 
Comoseris, VOrb. (Fig. 168). Like Tham- 
nastraed, but with calices separated into groups 
Fig. 168. by ascending flexuous ridges. Jurassic and 
Comoseris conferta, Reuss. Oligocene; ‘Tertiary. 
aes A Obie BRE VAPOLZa ane aE Astracomorpha, Reuss. Coralla composite, 
tuberous, basally expanded, or branching, 
and covered with corrugated epitheca. Corallites small, united by short and 
stout costal septa; columella styliform. Trias to Oligocene. 
Microsolena, Lamx.; Trias and Jurassic. Dimorpharaea, From. ; Jurassic. 

