U. S. B. F.— Doc. 890. 



PLATE XI. 



flu. 1.— TONGING OYSTERS, WORKING THE TONGS ON THE BOTTOM. 

 (Photo from Prof. E. N. Cory, Maryland State University.) 



FIG. 2.— TONGING OYSTERS, LIFTING AND EMPTYING THE TONGS. 

 (Photo from Prof. E. N. Cory, Maryland State University.) 



