238 



MR, W. HILL ON THE BEDS BETWEEN THE 





Dover. 



Cambridge- 

 shire. 



Eihynchonella Mantelliana, Sby.. . 







* 



* 



Martini, Mant 



Spondylus, sp. ... 



Inoceramus mytiloides, Mant. 



Brongniarti, Sby 



Ouvieri, Sby 



problematicus, d'Ovb. 



Ostrea vesiciilaris, Lam 



Hippurites (Mortoni) t 



Ptychodus decurrens, Ag 



Ijamna subulata Ag 



plicatella, Reuss 





Zone of Terebratulina gracilis. — Above the line indicated as the 

 top of the zone of Bhynchonella Cuvieri, the typical fossil Terebra- 

 tulina gracilis occurs abundantly both in the chalk exposed at the 

 western end of Shakespeare's- Cliff tunnel and at the east of Dover. 

 With the exception of this, other fossils are not common, although 

 the chalk is full of fragments. I see no reason for subdividing 

 this zone ; the fossils in the appended list were found throughout, 

 with the exception of Micraster cor-hovis, which only occurred in 

 the upper part of it. 



I estimate the thickness of the zone to be 150 feet, its upper limit 

 being about the commencement of the hard chalk. 



List of Fossils of the Zone of Terebratulina gracilis. 





Dover. 



Cambridge- 

 shire. 



Ventriculites mam millaris, Smith 



* 



* 

 * 



Parasmilia centralis ' Mant 



Micraster cor-bovis, Forbes 



breviporus, Ag 



Holaster planus, Mant. 



Cyphosoma simplex, Forbes, = radia- 

 tmn. Sang 





Discoidea minima (-Ag.) 



• Dixoni, Forbes 



Cidaris serrifera (spines), Forbes 



sceptrifera, Mant 



Echinoconus subrotundus, Mant 



Hemiaster minimus, Ag 



Goniaster (ossicles) 



Serpula ilium, Sby 





t This specimen was found by Mr. G-riffiths 

 above the " Grit Bed." 



of Folkestone. It occurred just 



