SUBCLASS II 



HEXACORALLA 



99 



Fig. 147. 



Thecosmilia trichotnmri 



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

 developed ; columella spongy ; pali in front of all cycles 



excepting the last. Cretaceous to Recent. 



ij. Branching coralla mnltiplying by fission. 



Calamophi/llia Blainv. (jRJiahdophyllia 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. dathrata (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 Freeh identical with Calamophi/llia. Very (GoTd7.)7 "X^rai-iiag T Na'tt 



° . rn . . , -r . heiiii. Natural size. 



common m iriassic and Jurassic. 



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



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. 



AspidisciisYJdn\g(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, 

 and form by their union a banded margin. Cretaceous. 



Stiboria Etall. Jurassic. Stelloria d'Orb. Cretaceous. Symphyllia E. and 

 H. Tertiary and Recent. 



Fifi. 148. 



Leptoria kotiiiicld Reuss. Upper 

 Cretaceous ; Gosau Valley. Natural 

 size. 



Fio. 149. 



Aspidisms cristatiis 

 Kiiuig. Middle Cre- 

 taceous ; Batna, Al- 

 geria. Natural size. 



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 



