244 



ACTINOZOA. 



ThecidcB, does not survive it. The following genera 

 are peculiar to the Silurian series : 



6. Devonian Corals. — 



Excepting the genus Aulo'pora, and the am- 

 biguous form Pleurodictyurrif the Devonian Corals 

 consist wholly of Rugosa and Tabulata, One 

 family, Seriatojporidce, first makes its appearance 

 in this formation, and one, Cystiphyllidce, does 

 not survive it. The following genera are exclusively 

 Devonian : 



PORITID^. 



Pkurodictyum. 



AULOPORID^. 



Aulopora. 



SERIATOPORIDiE. 



Dc7idropora. 

 Trachypora. 

 Favositidje. 

 Thccostegites. 

 Chonostcgitcs. 

 Roemrria. 



MlELEPORIDJE. 



Battersbyia. 



Cyathophyllidje. 



Smitkia. 



Spongophyllum. 



Acervidaria. 



Endophylhon. 



PachyphyUum. 



Heliophyllinn. 



Chonophyllum. 



Anisophyllum. 



Baryphyllum. 



Hadro'phyllum. 



Hallia. 



CoiubopTiyllum. 

 Stattrid^. 



Metriophyllum. 



of 



Car]5>OBiiferoiis Corals. — 



In addition to the genus Pyrgia, the Coral fauna 

 the Carboniferous rocks seems to be wholly 



