104 ANTHOZOA 



Cambrian. A few genera which may be corals have been found 

 in the Cambrian in North America, Sardinia and Spain. 



Ordovician. In North America corals (especially Streptelasma) 

 are common in this system, but in England only a few forms have 

 been found, the most important being Favosites, Heliolites, Haly sites. 



Silurian. Corals are very abundant, especially in the Wenlock 

 Limestone. Cyathophyllum, Acervularia, Omphyma, Lindstrcemia 

 Goniophyllum, Syringopora, Favosites, Heliolites, Plasmopora, Pro 

 pora, Haly sites. 



Devonian. Cyathophyllum, Acervularia Phillipsastrwa ( = Smi 

 thia), Cystiphyllum, Calceola, Favosites, Fachypora, Pleurodictyum 

 Heliolites. 



Carboniferous. Cyathophyllum, Lithostrotion, Clisiophyllum 

 Dibunophyllum, Cyclophyllum, Lonsdaleia, Zaphrentis, Cyathaxonia 

 Caninia, Amplexus, Cleistopora, Michelinia, Syringopora. 



Permian. Only a very few forms have been found. 



Trias. Corals are absent in England, but abundant in the Alpine 

 Trias ; most of the Palseozoic forms have become extinct and in 

 place of them are Rhabdophyllia, Cladophyllia, Montlivaltia, 

 Thecosmilia, Isastrcea, Phyllocoenia, Astroccenia, Stylina, Omphalo- 

 phyllia. 



Jurassic. Montlivaltia, Isastrwa, Thamnastrwa and Thecosmilia 

 are found in the Lias but are not common ; in the Oolites they 

 become very abundant and several other genera also occur, e.g. 

 Stylina, Cyathophora, Cladophyllia, Calamophyllia, Anabacia. 



Cretaceous. Corals are not abundant in England ; the chief 

 forms are Parasmilia, Trochocyathus, Micrabacia, Holocystis. In 

 some parts of Europe, especially in the Gosau beds (of Chalk age) of 

 the Austrian Alps, corals are very numerous, and include Astroccenia, 

 Montlivaltia, Isastrwa, Cyclolites, Thamnastrwa, etc. 



Cainozoic. Corals are rare in English Cainozoic formations : 

 Turbinolia, Dendropkyllia, Ocidina and Goniopora (Litharwa) occur 

 in the Eocene ; Madrepora in the Oligocene ; Flabellum in the 

 Pliocene. In the middle and south of Europe, corals are found 

 abundantly in various Cainozoic deposits. 



