134 



found in other European deposits with which they have heen 

 compared, as those of Gothland, and Bohemia, but they are in 

 general distinct from the species found in the Silurian rocks of 

 North America. We are, in all, acquainted with about 130 

 species of Silurian Corals; 120 of these belong to the groups 

 Z. tahulata, and Z. rugosa. Seventy-six of these Corals are found 

 in England, and about half of them have not been met with 

 elsewhere. Most of the British species belong to the famihes 

 Eavositid^ and Cyathophyllid^, four species of Paloeocyclus, 

 of the family Fungid^e, and Protarcea, Poritid^, are the only 

 generic exceptions at present known. 



The ZoANTHAEiA TABTTLATA attain a great development in 

 the Silurian period, and are represented by the following genera: 



The ZoANTHAEiA KTTGOSA, which are limited to the Palaeozoic 

 epoch, are very abundant in the Silurian rocks. 



Statteid^ Cyathaxonid^ 



Stauria 



Cyathophyxlid^ 



Zaphrentis 



Aulacophyllv/m 



Cyathophyllum 



Streptelasmn, 



Ompliyma 



Goniophyllwm, 



Cyathaxonia 



Ptychophyllum 



Syringophyllum 



Eridophyllum 



Stromhodes 



Clisiophyllwm 



Gystiphyllv/m 



