400 



CRETACEOUS LAMETJJBRANCHIA. 



202 



203 



Figs im— 203.— Exorjyra sinuata (Sow.). Sodtjwiclc Musuuui. 199, 200, right aiiJ left valves of one 

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

 Claxby. 203, Claxby Ironstone, Donnington. All x J. 



