128 



THE FRESH-WATER MUSSEL 



as a juvenile mussel ready to begin life on the bottom (Figs. 60 and 

 61). Draw the glochidium on a large scale as it appears when gaping 

 and from a lateral view when closed. Closure can be effected by 



Fig. 60. — The development of fresh-water mussels. A, glochidium of Lamp- 

 silis; left, from po.sterior view, right, from lateral view. B, successive 

 stages in the embedding of a glochidium of Lampsilis on a gill filament of a 

 fish. C, fin of a fish with a number of embedded glochidia of Symphynota. 

 D, juvenile Lampsilis, showing the persistent glochidial shell. 



(From G. Lefevre and W. C. Curtis, 1910, Bulletin F. S. Bureau Fivhcries, vol. 30.) 



adding a drop of such a stain as methyl green to the water in a watch 

 glass containing glochidia. 



