400 



CRETACEOUS LAMELLIBRANCHIA. 



Figs. 199 — 203.— Exogyra sinuata (Sow.). Sedgwick Museum. 199, 200, right and left valves of one 

 specimen ; Lower Greensand, Atherfield. 201—203, left valves. 201, 202, Tealby Limestone, 

 Claxby. 203, Claxby Ironstone, Donnington. _ All x |. 



