EXOGYRA. 



411 



230 



Figs. 215— 231.— Exogyraconica (Sow.). 215— 226, Upper Greensand. 227— 231, Chalk Marl. Sedgwick 

 Museum except 219, 224, 228. 215, 216, Niton ; left and right valves. 217, 218, Ventnor ; left and 

 right valves. 219, Haldon ; British Museum, No. L. 16860 ; left valve of ribbed variety. 220—223, 

 zone of Schlcenbachia rostrafa, Blackdown ; left valves. 222, right valve of 221. 224, zone of 

 Pecten asper, Warminster ; Bristol Museum ; left valve. 225, zone of P. asper, Evershot ; left 

 valve. 226, zone of Schlcenbachia rostrata, Dunscombe ; left valve. 227, Folkestone ; left valve. 

 228, 229, Blue Bell Hill, Burham ; British Museum, No. L. 10382; left valve and dorsal view. 

 230, 231, Folkestone ; left valve and dorsal view. All natural size. 



