94 Mr. De la Beche on theGeographical Distribution of Organic 



List of Organic Remaitis in the Lias of the North of France^ 

 according to M. Boblayc. 



Shells: — Belemnites (abundant); Ammonites (species not enumerated); 

 Gryphfea arcuata Lam., (incurva Sow.); Ostrea or Gryphaea nana; Pecten 

 (large) ; Plagiostoma gigantca; Plagiostoma/juwrfa^a ; Cytherea (abundant) ; 

 Pleurotomaria ornata ; Cirrus. 



From the foregoing Lists the following Table of Lias Organic 

 Remains which occur in more than one situation may be 

 constructed : 



Name. 



North of South of 

 England. England 



Nor- North of 

 mandy. France, 



South of 

 France. 



Plants, Lignite or Coal... 



Plesiosaurus 



Ichthyosaurus 



Crustacea 



Fish 



Polypifers 



Echinites 



PentacrinitesCaputMedusae 



■ Briareus.., 



subangularis . 



Belemnites (abundant).., 

 Ammonites Walcotii . .., 



fimbriatus .., 



Henleii , 



communis.... 

 planicostatus , 

 falcifer 



Turneri 



stellaris 



Bucklandi .. 



obtusus 



GryphEea incurva Sow. 



arcuata Lam. 



Maccullochii 



Spirifer Walcotii 



Terebratula ornithocephala 



acuta 



tetraedra .. 



Plicatula spinosa 



Pecten equivalvis 



Plagiostoma gigantea ... 



punctata .. 



Avicula inaequivalvis . .. 



Modiola scalprum 



Hillana 



Trochus anglicus 



imbricatus 



Unfortunately 



