Dumortier. 



Oxyn. Oppeli? 

 = Oppeli D. 







Planicosta bed. 

 = Raricoatatus bee 



isD. 



Oxynotus bed. 

 bed. 



Oxynotus Zone. J 



Oxyn. Buvigneri 

 = Buvigneri D. 



I 

 Oxyn. Guibali 

 = victoris D. 



Oxyn. Simpsoni Oxyn. Aballoense 



= Oxynotum (pnrs) = " D. 



Oxyn. Lymense 

 = Saemanni D. 



Oxyn. Oxynotum 



= Oxynotum (pars) D. 



Stellaris bed. 



— Obtusus and Tu 



berculatus beds 



Davidsoni bed 



(Striaries bed). 

 = Upper Buckland 

 bed. 



-Agas. striaries 

 = Davidsoni 

 = Berardi (pars) D. 



I 

 Agas. lasvigatnm 

 = Berardi (pars) D. 



Oxyn. Guibalianum? 

 = " D. 



I 



._ = Lower Bucklanc 



Backlandi Zone. < befl 



Agas. striaries Agas. Scipionianum 



= Davidsoni D = " D. 



Angulahis Zone. • 



= Angulatus bed. 



Agas. laevigatum 

 = " D. 



t.1 ... r, 1 Liasicus bed. 



Planorbis Zone. { = Caloceras bed 



i See Part II., p. 174. 



- This is a form mentioned in Part I., p. 115, probably a species of 

 Coroniceras, allied to Cor. kridion or rotiforme. 



3 The species of the Arnioceran series are arranged in line accord- 

 ing to the beds in which they occur. It was not possible to trace the 

 genealogy accurately. . 



