LeptjENA, Dalman, 



Rapinesquina, - - - 



yTROPHEODONTA, Hall, 



Pholidostrophia, - 

 Leptostrophia, - 

 Brachyprion, Shaler, 

 DouviLLiNA, Q5hlert, - 

 Strophonblla, Hall, - 



A.MPHiaTROPHIA, - 



Leptblla, - - - - 

 Plectambonitbs, Pander, 

 Christiania, - - - 

 Leptjenisca, Beecher, 

 Davidsonia, Bouchard, 

 Chonetbs, Fischer, - 



Anoplia, . - - 



Chonbtina, Ki'otow, 

 Chonostrophia, - - - 

 Chonopectus, 

 Chonbtblla, Waagen, 

 Strophalosia, King, 

 Daviesiblla, Waagen, 

 AuLOSTEGES, von Helmersen, 

 Productus, Sowerby, - 

 Productella, Hall, 

 Marqinipbra, Waagen, 

 ■ Proboscidella, CEhlert, - 

 Etheridqina, CEhlert, 



pi 



o e o 



1-1 g D ooHPSo?;^© 



5 -r » 



ZJ ^ '— 





Middle Devonian of Europe. 



Permian of Russia. 



Upper Carboniferous of India. 



Coal Measures of Europe. 



-7- 



Coal Measures of Europe. 



