[Photo by Vii'idha. Kala Mandir, Baroda. 



Anatomy of window-pane oyster as seen after the removal of the left valve and mantle, 

 showing the fine strands of the pallial muscles and the deeply pigmented ventral 

 pallial sinus within the right mantle, the gills, adductor muscle, foot, cardinal 

 hinge teeth, etc. Part of the pallial sense organ shows just under the posterior 

 tip of the gills. The great extent of the branchial mesentery is conspicuous, 

 and the outer accessory fold of the reflected branchial lamella is discernible. 

 Two small pearls are seen in situ close together in the ventral region of the 



mantle. X f 



[To face p. 56. 



