ACTINOZOA. 



245 



made up of Rugosa and Tabulata. Three families, 

 Aidoporidce, Cyathophyllidce, and Cy athaxonidce > 

 do not outlive this period. The following genera 

 are restricted to the Carboniferous deposits : 



AXJLOPORID^. 



Pyrgia. 



SERIATOPORIDiE. 



Bhabdopora. 

 Cyathophyllid^e. 

 Axophyllum. 



CYATHOPHYLLID2E 



Lonsdaleia. 



Stylaxis. 



Chonaxis. 



Atdophyllum. 



Men op hyllum. 



Trochophyllum. 



8. Permian Corals. — 



The few Permian Corals hitherto found belong 

 to the Rugosa and Tabulata. The genus Poly- 

 coelia, of the family Stauridce, is peculiar to this 

 period. 



9 



Triassic Corale. 



Fossil remains of Corals are scarce in the Trias. 

 The family Astrazidce, so abundantly represented 

 in all subsequent formations, now first makes its 

 appearance. To this group most of the Triassic 

 Corals have been referred. The Favositidce are 

 represented by the old genus Choetetes. It can 

 scarcely be said that any genera of Corals are 

 characteristic of this formation. 



10. Jurassic Corals. 



There are no Rugosa in Jurassic rocks, and 

 Millepora, a recent genus, is the sole representa- 

 tive of the Tabulata. The greater number of 

 Jurassic Corals belong to the Aporosa, and cer- 

 tain beds of this series have received the name of 

 Coral-Rag from the great abundance of Astrceidce 

 which they contain. The genera Stylina and 



R 3 



