152 0. 2£eijer — Species in the French Old-Tertniry. 



LOWER EOCEXE. 



1 5 Lucina discors Desh. 



16 Lucina proxima Desk. 



n| 



1 8 Diplodonta d u p 1 i c a t a 

 Desk. 



24 



MIDDLE EOCEXE. 



UPPER EOCEXE. 



OLIGOCEXE. 



Lucina Saxorum Lam. 

 Lucina elegans Defr. 



Cardium obliquum Lam. 

 Cardium hybridum Desh. Cardium porulosum Lam. 

 Cardiiun granulosum 

 Lam. 



Cytherea proxima Desh. 

 Cytherea fastidiosa Desh 



Tellina pseudorostralis 

 cV Orb. 



Tellina decorata Watel. 



Mactra Levesquei d 1 Orb. 

 30JCorbula gallicula Desh. 

 31;Corbula striatina Desh. 

 32 1 Corbula muricina Levesq. 

 33 Corbulomya seminulum 

 Desh. 



Cytberea semi sulcata 



La?n.\ 

 Cytberea analoga Desh. 

 Tellina rostralis Lam. 



Tellina donacialis Lam. 



Mactra semisulcata Lam. 

 Corbula gallica Desh. 

 Corbula Lamarcki Desh 

 Corbula minuta Desh. 



Lucina Ermenonvilleosis 

 aV Orb. 



Lucina elegans Defr. 

 Diplodonta elliptica Desh. 



Cardium Bouei Desh. 



Glossophora. 



Delpbinula turbinoides 



Lam. 

 Bifrontia serrata Desh. 



34 Delpbinula turbinata 

 Desh. 



35 Bifrontia Laudunensis 

 Desh. 



36|Turritella Dixoni Desh. 



37 Calyptrsea Suessoniensis Calyptra3alainellosa.Des/i 

 Desh. 



Turritella carinifera Desh 



Hipponix elegans Desh. 



Natica patula Desh. • 

 Natica depressa Desh. 

 Natica abscondita Desh. 

 Natica epiglottina Lam. 

 Natica semiclausa Desh. 

 Natica acuta Desh. 

 Diastoma costellatu m 



Lam. 

 Pyramidella terebellata 

 Fer. 

 Odostomia turbonilloides Odostomia turbonilloides 



Natica semipatula Desh. 

 Natica intermedia Desh. 



Natica separata Desh. 



Diastoma variculosum 

 Desh. 



Cytberea striatula Desh. 



Cytberea pobta Lam.\ 

 Cytberea cuneata Desh. 



Tellina parilis Desh. 

 Tellina symmetrica Desh. 



Corbulomya complanata 

 Sow. 



Delpbinula turbinoides 

 Lam. 



Cardium scobinu- 

 la* Mer. 



'Cytberea incras- 

 sata Sow. 



Turritella copiosa Desh. 



Calyptrasa label- 

 : lata Desh. 



Hipponyx 

 Desh. 



patelloides 



Desh. 



Turbonilla 



Desh. 



polygyrata 



Desh. 

 Turbonilla fragilis Desh. 



Natica abscondita Desh. 

 Natica Noae oV Orb. 



Natica ponderosa Desh. 

 Diastema interrupting 



Desh. 

 Pyramidella inaspecta 



Desh. 



Pseudomelania bordana Pseudomelania bordana 



Lam. sp. Lam. sp. 



Pseudomelania 1 a c t e a 



Lam. 



Odostomia obe- 

 sula Desh. 



Pseudomelania 

 semidecussata 

 Lam. 



* Compare tbe specimens of tbe Mayence Basin. 



f If these two species occur near each otber, tbey must have a very near common ancestor. 



