Bull. U. S. B. F., 1917-1: 



Plate XXXI. 



Fig. I. 



-Mussel boats on Rock River Pool at Government locks, a few miles above the mouth of the river, 

 taken by hand while wading in the shoal water below the dam. (See p. 59.) 



The mussels are 



Fig. 2. — The mussels when taken are put into a small flatboat and conveyed to the dam, where they are transferred to another 

 boat above the dam, as illustrated. In the second boat the mussels are taken to camp for cooking out. This is the scene 

 of one ot the most extensive mussel fisheries where shells are taken by hand. (See p. 59.) 



