>UBCLASS II 



HEXACORALLA 



99 



Goniastrea E. and H. Corallites prismatic, calices polygonal. Septa well 

 cleveloped ; columella spongy ; pali in front of all cycles 

 excepting the last. Cretaceous to Recent. 



'7], Branching coralla multiplying hy fission. 



Calamophyllia Blainv. (Bhabdophyllia E. and H.; 

 Lithodendron p. p. Mich.) (Fig. 146). Colony fasciculate 

 or bushy ; corallites very long, cylindrical. Wall 

 costate, without epitheca ; columella absent. Trias, 

 Jurassic and Tertiary. Especially common in Alpine 

 Trias. C. clathrata (Emmrich). 



Thecosmilia E. and H. (Fig. 147). Colony bushy, 

 calices dividing by fission, and more or less free. 

 Epitheca corrugated, readily wearing away ; columella 

 absent or rudimentary. Trias to Tertiary. Accord- 

 ing to Frech identical with Calamophyllia. Very 

 common in Triassic and Jurassic. 



Baryphyllia From. HymenophyUia E. and H., etc. Cretaceous. 



Fig. 147. 

 Thecosmilia tric 

 (Goldf.). Coral-Rag 

 heim. Natural size. 



hotoma 

 : Natt- 



0. Coralla with confluent calices increasing by fission. 



Leptoria E. and H. (Fig. 148). Corallum massive, composed of labyrinthic 

 rows of confluent corallites with fused walls. Septa closely crowded, 

 approaching parallelism ; columella lamellar. Jurassic to Tertiary. 



Diploria E. and H. Like the preceding, but with corallites united by 



produced costal septa instead 

 of directly by their walls. 

 Cretaceous to Recent. 



Aspidiscus König {F\g. 149). 

 Corallum discoidal, circular or 

 elliptical, covered on lower side 

 with wrinkled epitheca. Cali- 

 cinal furrows radiating from the 

 centre outwards, and separated 

 from one another by sharply 

 crested ridges. In the centri- 

 fugally disposed corallites the 

 outermost septa are thickened, 

 Cretaceous, 



Cretaceous. Symphyllia E. and 



Fig. 148. 

 Leptoria koniiicki Reuss. Upper 

 Cretaceous ; Gosau Valley. Natural 



Fig. 149. 



Aspidiscus cristatus 

 König. Middle Cre- 

 taceous ; Batiia, Al- 

 geria. Natural size. 



and form by their union a banded margin. 



Stiboria Etall. Jurassic. Stelloria d'Orb. 

 H. Tertiary and Recent. 



Family 6. Eusmiliidae Verrill. 



Like the Astraeidae, except that upper septal edges are entire, not serrated. 



a. Simple coralla. 



Trochosmilia E. and H. (Fig. 150). Turbinate, base acutely pointed or 

 Septa numerous, extending to the centre. Without epitheca, 

 costae granulated. Columella absent, dissepiments numerous. Cretaceous 

 and Tertiary. 



encrusting, 



