140 



approacli to the form of one of the Atoll or Barrier reefs of the 

 present day, either in the Carboniferous or any other Palaeozoic 

 Limestone." ^ 



The fauna of the Mountain Limestone is extremely rich in 

 Actinozoa, about eighty species of Corals having been found in 

 its different beds, and none of these have been discovered in any 

 other formation. About one-half of this number are British : 

 they all belong to families which prevailed during the Palaeozoic 

 epoch, and a great many of the genera now appear for the last 

 time. 



The ZoANTHARiA APOROSA, and the Zoantharia perforata, 

 are not represented. 



The ZoANTHARiA TABTJLATA diminish in number and importance: 

 they are represented by — 



MlLLEPORID^. 



Fistulipora 



Favosites 

 Emmonsia 

 Michelinia 

 Alveolites 



Favositid^. 



Prop or a 



Beaumontia 



Ghcetetes 

 Syringopora 



Se kiatoporid^ 

 Rhahdopora 



The ZoANTHARiA RUGOSA are numerous in genera, and appear 

 for the last time. 



C YATH AXOlSriD^ 



Cyathaxonia 



Cyathophyllid^ 

 Zaphrentis PhilUpsastrcea 



Amplexus Lithostrotion 



Menophylhmi Clisiophyllum 



Labophyllum Chonaxis 



Trochophyllum Petalams 



Cyathophyllum 

 Campophyllum 

 Aulophyllum 



Axophyllum 

 Lonsdalia 



' Jukes' Student's Manual of Geology, 1862. 2nd. Ed., p. 537. 



