EXOGYRA. 



41] 



230 



231 



Fios. nry—2ai.—Exogyraconica (Sow.). 215-226, Upper GrcensanU. 227— 231, Chalk Marl. SedRwick 

 Miiseuiii except 219, 224, 22S. 215, 21(5, Niton : left and right valves. 217, 21S, Vontnor ; loft and 

 right valves. 2I'.I, Ilalilon ; Rritish JIuseum. No. L. UiSCO ; loft valvo of rihiiod variety. 220— 22;{. 

 zone of Hchlwnhachiii rosti-a/u, Ulackdown ; loft valves. 222, riglit valve of 221. 221, zone of 

 I'ecten asper, "Warminster; Hristol Miisoiini ; loft valve. 225, zone of P. aspcr, Evei-shot; left 

 valve. 226, zone of Sr/i(a;Hfcnc/ii(i i-o«()-<i(ii, Dunscombo; loft valve. 227, Folkestone; left valvo. 

 228, 22il, Blvie Bell Hill, Hurham ; British .Museum, No. L. 1U382; left valvo and doi-sal view. 

 230, 231, Kolkostone ; left v;ilve and dorsal view. All natural size. 



