190 



CARBONIFEROUS LAMBLLIBRANCHIATA. 



Actinozoa would show that a very much smaller percentage of organisms survived 

 after the Carboniferous Limestone epoch. 



It will be noted that I have been able to recognise a much larger number of 

 species of Lamellibranchs as common to the Carboniferous Limestone of Belgium 

 and Great Britain and Ireland than de Koninck thought was the case. 



He described 461 species as occurring in the Carboniferous Limestone of 

 Belgium ; of these he stated that 35 species were found in England and Ireland 

 and 18 species in Scotland. 



While on the one hand one cannot help coming to the conclusion that a very 

 large number of de Koninck's species will not bear examination, and that his list 

 includes a number of synonyms, I have recognised 124 species as common to the 

 Carboniferous Limestone Series of both countries. Twenty-five other species occur 

 in the Upper Carboniferous Series, making 149 species. This is notwithstanding 

 the marked difference in lithological character of the lower Carboniferous deposits 

 in Belgium and Great Britain and Ireland, which consist, especially in the North 

 of England and Scotland, of a large amount of detrital material, in the muds of 

 which a somewhat different fauna occurs to that which obtains in the almost 

 purely organic deposit of Limestone. 



Species occurring in the Carboniferous Limestone of Belgium and Great Britain 

 and Ireland : 



Amusiwm tenue, de Kon., sp. 



,, concentricum, de Kon., sp. 

 Syncyclonema Sowerbyi, M'Coy, sp. 

 Pseudamusium auriculatum, M'Coy, sp. 

 „ anisotum, Phill., sp. 



„ ellipticum, Pliill., sp. 



Aviculopecten Murchisoni, M'Coy, sp. 



,, Buthveni, M'Coy, sp. 



interstitialis, Pliill., sp. 



,, [ihnxirhithrtitus, M'Coy, sp. 



,, nobilis, de Koninck. 



,. ii/rrnssntiis, M'Coy, sp. 



,, stellaris, Pliill., sp. 



,, perradiatus, de Kon. 



,, Forbesii, M'Coy, sp. 



„ dissimilis, Fleming, sp. 



,, constans, de Kon. 



Pterinopecten Dumontianus, M'Coy, sp. 



,, tessellatus, Pliill., sp. 



„ cximius, de Kon. 



,, granosus, Sow., sp. 



,, radiatus, Phill., sp. 



Streblopteria laevigata, M'Coy. 

 Ewmicrotis hemisphericus, Phill., sp. 



,, ovalis, de Kon, sp. 



Viihiiilinui Biifhituta, de Kon, sp. 



,, simplex, Phill., sp. 



I'lisiihiiiitiiiyn liiuicUom, de Kon. 

 Leiopteria Thompsoni, Portlock, sp. 

 ,, laminosa, Phill., sp. 



,, lunulata, Phill., sp. 



,, hirundo,de Kon. 



Pteronites angustatus, M'Coy. 

 Protoschzodus eguilateralis, M'Coy, sp. 

 ,, subtruncatus, M'Coy, sp. 



Cardiomotpha oblonga, Sow., sp. 

 „ communis, de Kon. 



,, Nysti, de Kon. 



,, orbicularis, M'Coy. 



,, ventricosa, M'Coy. 



,, corrugata, M'Coy. 



„ Egertoni, M'Coy. 



Edmondia unioniformis, Phill., sp. 

 Josepha, de Kon. 



