OSTREA. 37:5 



mucronata of Norwich, is in the British Museum. 0. hippopodium, Nilsson, from 

 the Upper Chalk of Kopinge, is in the Lund Museum. The specimens of 0. hippo- 

 podium figured by Goldfuss from the Cenomanian of Essen, are in the Munich 

 Museum. The examples of 0. vesicularis figured by William Smith came from 

 Norwich and are in the British Museum. The original of Gryphsea globosa var. 

 depressa, Sowerby (in Dixon), cannot be found; the specimens of Ostrea figured by 

 the same author (Dixon, pi. xxviii, figs. 22, 23), from the zone of Holaster subglobosus 

 near Warminster, are in the British Museum. The specimen figured by S. P. 

 Woodward as 0. vesiculosa from the Upper Chalk of Sussex, is also in that Museum. 

 Avicula filata, Etheridge, from the Totternhoe Stone of Burwell, is in the Sedgwick 

 Museum. 



Fig. 182. — Ostrea vesicularis, Lam. Zone of Ostrea lunata, Trimingham. Dr. Rowe's Collection. Left 



valve, x |. 



Distribution. — Lower Greensand (Ferruginous Sands) of Shanklin. Gault of 

 Folkestone. Cambridge Greensand. Upper Greensand (zone of Scldcenbachia 

 rostrata) of the Isle of Wight. Upper Greensand (zone of Pecten asper) of War- 

 minster. 



Chalk Marl (zone of ScMoenbachia varians) of Folkestone, Offham, and Burwell. 

 Cenomanian (Meyer's bed 11) of Beer Head. Cenomanian Sandstone of 

 Wilmington. 



Zone of Holaster subglobosus of Chilcomb (Hants), Glynde (Lewes), Burham, 

 Arlesey, Ickleford (near Hitchin), Cherry Hinton, Burwell, and Isleham. 



Zone of Bhynchonella Guvieri of the South Devon coast and Dover. Melbourn 

 Rock, Melbourn. 



49 



