124 THE OYSTER. 



PLATES X, XI, XII, XIII, XIV, XV. 



Tiles which were deposited in the Little Annamessex River 

 by Lieut. Francis Winslow, U. S. N., on July 9, 1879, for the 

 collection of oyster spat. From Winslow's Report on the 

 Oyster Beds of Tangier and Pokamoke Sounds. 



PLATES X AND XL Upper and lower surfaces of a 

 tile which was removed on August 2, twenty-four days 

 after it had been placed in the water. 



PLATES XII AND XIII. Upper and lower surfaces 

 of a tile which was removed on August 23, forty-five 

 days after it had been placed in the water. 



PLATES XIV AND XV. Upper and lower surfaces 

 of a tile which was removed on October 10, about three 

 months after it had been placed in the water. 



