Lept^na, Dalinaii, 



RAh'INESQCINA, . - - 



STROPHEOnOXTA, Hilll, 



Pholidostrophia, - 

 Leptostrophia, - 

 Brachyprion, Slialev, 

 Douvillina, (Ehlevt, - 

 Strophonella, Hall, - 



Amphistrophia, - 

 Leptella, - - - - 

 Plectambonites, PaTider, 

 Christiania, . - - 

 Lept^nisl'a, Beecher, 

 Davidsonia, Bouchard, 

 Chonetes, Fischer, - 



Anoplia, - - - 



Chonetixa, Krotow, 

 Chonostrophia, - - - 

 Chonopectus, 

 Chonetella, Waagen, 

 Strophalosia, King, 

 Daviesiella, Waagen, 

 AuLOSTEOES, von Helnierseii, 

 Proddctus, Sowerby, - 

 Productella, Hall, 

 Marqinifera, Waagen, 

 Proboscidella, (Ehlert, - 

 Ethkridoina, G5hlert, 



S— ' . r 



(S 5 3 ^ 



"62 ~ z  



to 



lO ■= 



: s = £ 2- - -3 Is g 



3 3 



^ o 

 .so 



E a 



Middle Devonian of Europe. 



Permian of Rusi^ia. 



Upper Carbon) ferdus of India. 



Coal Measures of Europe. 



-7- 



Coal Measures of Europe. 



