GRIER 



THE FRESH WATER PEARL MAKERS 



339 



XN V^ 





Above. The mussel on its travels showing the gaping of the shell, the 

 mantle and the protrusion of the siphons. Below. Showing the 

 natural home and wanderings of a fresh water mussel. 

 Drawing by J. P. Miiller, College of City of Baltimore. 



