210 



CARBONIFEROUS LAMELLIBRANCHIATA. 





Eedesdale 



Four Laws 



The Main 



Lowick. 





Limestone. 



Limestone. 



Limestone. 



Aviculopecten incrassatus, M'Coy, sp 



X 









Pseudamusium redesdalense, Hind 



X 









Actinopteria persulcata, M'Coy, sp 



X 







X 



Pinna Jlabelliform is, Martin 



X 



X 



X 



X 



mutica, M'Coy, sp 



X 







X 



Modiola Jenlcinsoni, M'Coy, sp 





X 







Posidoniella elongata, Phill., sp 



X 



















,, redesdalensis, Hind 



X 









,, Verneuillii, M'Coy 



X 









Parallelodon reticulatum, M'Coy, sp 





X 







Nucula gibbosa, Flem., sp 



X 







X 



,, undulata, Phill 



X 









Ctenodonta Itevirostris, Portl., sp 



X 









Nuculana attenuata, Flem., sp 



X 







X 



,, brevirostris, Phill., sp 



X 







X 



Schizodus axiniformis, Phill., sp 



X 









Protoschizodus axiniformis, Portl., sp 



x 







X 











X 













Cardiomorpha parva, Hind 



X 









Edmondia arcuata, Phill. , sp 



X 



X 







,, lowiclcensis, Hind 





X 





X 



,, Ma ccoyi, Hind 





X 





X 











X 



„ pentonensis, Hind 



X 

















X 



,, sulcata, Phill., sp 



X 



X 



X 



X 











X 



Sedgunckia ovata, Hind 



X 









Gypricardella annm, de Ryck., sp 







X 





Sanquinolites clavatus, M'Coy, sp 



X 









, , plicatus, Portl. , sp 



X 





X 



X 



,, striate/granulosus, Hind 



X 









,, tricostatus, Portl., sp 



X 



X 







„ variabilis, M'Cov, sp 



x 



X 



X 



X 



,, V. scriptus, Hind 



... 









,, visetensis, de Kon 



X 









Allorisma monensis, Hind 



... 





X 





,, sulcata, Flem 



X 



X 



X 



X 



„ variabilis, Hind 



X 



X 



X 



X 



Solenomya costellata, Phill 



... 



X 



X 



X 



,, primaiva, M'Coy 







X 



X 



Clinopistha abbreviata, de Eyckholt, sp. ... 





X 











X 











X 







Conocardium aliforme, Sow., sp 





X 





X 



The net results of the distribution of the Lamellibranchs in Carboniferous 

 rocks are important, because many species occur only at certain definite horizons, 

 and therefore are of value as zonal indices. 



For example, Modiola Mac.adamii, M. lata, Lithodomus carbonarius, Leiopteria 

 divisa, Edmondia truncata, Posidonomya radiata, Aviculopecten eshdalensis occur only 



