[ 6 ] 



Diagram B. — Distribution and relationship of the species connected 

 luith Inoceramus neocomiensis. 



ZONES 



inconstans bait 

 ^ 



ctis_: 



ingua 

























Belemuitella 









' "■' d 



mucronata 



var. 

 saruraeiisi^s^ 









^1 1 



S T ° tuberculatus 

 -.„, .-- ^ 



Actinocamax 













quaclratiis 













Marsupites 

 testudinarius 



var. 

 striatus 









cordiforir 



1 



''lamarcki & Upper Chalk 









varieties ^ — ^^.--— ^ 







unclulato- plicatus 





''subcardissoides 

 1 digicatus 



Gor-anguinum 



S pinnitormis 

 involutus I corr.ugatus 



■ 



■ 











Micraster 



■ 

 ■ 











cor-testudinariui 



■ 

 1 ■ 



■ 



lablatiis 

 var. latus 









Holaster 











planus 





costel 



laliiatuS 



latus 









Terebratulina 





■ 







lata 











Ehynchonella 

 cuvieri 





crippai var 

 rcacliPiisis 





lamarcki 



and 

 varieties 



Rolaster 











subglobusus 











ScliloenbacTlia 







criijpsi 





(Hystriohoceras') 









pictus 



varians 



















"' 1 







• 



UpperGreensand 









and Gault 



i 



anglicus 





XowerGreensand 



■ neocomiensis 



(Aptian) 





[The thick lines express the range of tlie species ; the thin lines connecting them 

 indicate what is believed to be the phylogeny of the species.] 



