400 Mr. Weaver on the Structure of the South of Ireland^ 



CoNCHiFERA (continued). Localities in carboniferous limestone. 



Leptsena(Producta) ilepressa (Stropho- 



mena marsupita, Defr.), Sow Richelle, Fermanagh. 



L. Scotica, Soiv Richelle, Chokier, Castlemaine. 



L. hemisphserica, Soto Richelle, Chokier, Ratingen, 



Buttevant, 



L. longispina. Sow Richelle, Linlithgow. 



L. sarcinulata, Soiu Richelle, Vise. 



L. scabricula, Soiv Vise, Liege, Dublin. 



L. rugosa (Strophomena, i?a;?re,), 



Dalm Chokier. 



Pterinea elegans, Gold/. Ratingen. 



Cardium elongatum, Sow Ratingen, Derbyshire. 



C. alaeforme. Sow Ratingen, Queen's County. 



Sanguinolaria concentrica, Phillips., . . Tour Mountain, County Cork. 



CaiNOIDEA. 



Actinocrinites 30-dactylus, Mill Mendip, Yorkshire. 



A. lasvis, Mill Ratingen. 



Rhodocrinites verus, Mill. .... Mendip, Bristol. 



PoLYPARIA. 



Gorgonia infundibuliformis, Gold/. . . . Arnsberg. 

 G. antiqua (Fenestella antiqua, 



Lons.), Gold/. Arnsberg. 



Cyathophyllum flexuosum, Gold/..... Limerick. 



C. pentagonum, Gold/. Namur. 



C. cjEspitosuni, Gold/. Chokier, Seilles. 



C. turbinatuni, Goldf. Richelle. 



C. quadrigeniinum, Goldf.. Berneau. 



Astrea ananas, de Blainvillc (Cyatho- 

 phyllum ananas, Goldf.) Namur. 



Favosites polymorpha, Goldf Namur, Elberfeld. 



F. fibrosa, Goldf. , Buffalo on Niagara River. 



It thus appearing that there are 47 species in the Eifel 

 limestone which are common to the carboniferous limestone, 

 it follows that they constitute about two ninths of the whole 

 number found in the Eifel, the ratio being as 47 to 209. 



On the other hand, we have seen that the Eifel limestone 

 contains 42 species which are common to the Wenlock lime- 

 stone, or onejifth of its whole number, the ratio being as 42 

 to 209. 



Hence, if we take these numbers as a guide, it may be said 

 that the Eifel limestone is in a slight degree more nearly allied 

 to the carboniferous limestone than it is to the Wenlock, the 

 difference lying between the ratios of 2 to 9, and 2 to 10. 



From the numbers which have been given it also resulft, 

 that the Wenlock limestone contains 95 species which are 

 distinct from those of the Eifel; and the Eifel limestone 167 

 species distinct from those of the Wenlock limestone; of which 

 47 species being also common to the carboniferous limestone, 

 it follows that 120 species may be said to be distinctive of the 

 Eifel, in contradistinction to the Wenlock and carboniferous 

 limestones. 



