94 



COELENTEKATA 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 



FIG. 167. 



Tliii-,itn(istraea prolifera, Becker. Upper Jurassic ; Nattheiin, Wiirttemberg. A, Corallum, 2/3 natural size; 

 w, Common wall. B, Lateral surface of costal septum, enlarged (8/j), showing trabecular constitution ; m, Line 

 of junction of two septa belonging to different corallites ; t, Trabeculae ; p, Trabecular lacunae (after Pratz). 

 C, Thamiti'xtrttni. ni/in-ii-ites, Goldf. Upper Cretaceous; Gosau, Salzkammergut. Portion of upper surface of 

 corallmn, 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 styliform 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, d'Orb. Like the preced- 

 ing, but with calices concentrically arranged 

 about a central individual. Trias to Tertiary. 

 Comoseris, d'Orb. (Fig. 168). Like T/iam- 

 nastraea, but with calices separated into groups 

 by ascending fiexuous ridges. Jurassic and 

 Tertiary. 



Astraeomorpha, 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. 



Fig. 1G8. 



Comoseris conferta, Reuss. Oligocene ; 

 Monte Carlotta, naer Vicenza. Twice en- 

 larged. 



