THE OLIGOCENE SERIES 



Fig. 191. GROUP OF OLIGOCENE FOSSILS. 



a. Chars medicaginula. 



b. Cyrena pulchra. 



c. Glandina costellata. 

 (I. Viviparus angulosus. 



e. Amphidromus ellipticuH. 

 /. Helix d'Urbani. 



g. Tomichia Duchasteli. 

 h. Potamides elegans. 

 i. Limnu'a longiscata. 

 /, . Planorbis euompbalus. 

 I. Dosinia incrassata. 

 m. Voluta Rathieri. 



C. THE ENGLISH SERIKS 



Headon Beds. This group is divisible into three portions, 

 Lower, Middle, and Upper, the Middle portion containing marine 



