Lept^sxa, Daliiiaii, 

 Rafinesquina, - - - 

 Stropheddonta, Hall, 

 Pholidostrophia, - 

 Lkptustrophia, - 

 Brachyprii'N, Slialev, 

 Doivii.LiNA, Gililert, - 

 Strophonella, Hall, - 



Amphistrophia, - 

 Leptella, - - - - 

 Plectambonites, Pander, 

 Uhristiania, - - - 

 Leptsnisca, Beecher, 

 Uaviusonia, Bducliaid, 

 Chonetes, Fischer, - 



Anoplia, . - - 



Chonetixa, Krotdw, 

 ch0n08tr0phia, - - - 

 Chonopkctus, 

 Chonetei.i.a. Waagen, 

 Strophalo.sia, King, 

 Daviesiella, Waagen, 

 Adlosteges, von Helniersen, 

 Productus, Sdwerby, - 

 Productella, Hall. 

 Maroinifera, Waagen, 

 Proboscidella, CEhlert, - 

 Etheriuoina, (Ehlert, 



t33 



•T" >. a 



" 3 t- ^ 



5 « S 2 §,?;■? 



S ~ "§ .S I I ■= 



H S S 5 Z J O 



^ = i: c 3 



p. * 



O S M 





Middle Devonian of Europe. 



Permian of Russia. 



Upper Carboniferous of India. 



Coal Measures of Europe. 



-?- 



Coal Measures of Europe. 



