[I'linh, I,,/ ]';,■;,//,. I Kah, Mnmlir, /In,;,,/,,.. 



Aiuitdinvof windiiw-paiic oysti'r as srcii after the removal of the left valve and mantle, 

 showinj;' the tine sti-ariils of the pallial museles and the deeply pigmented ventral 

 pallial sinus within the right mantle, the gills, adduetor 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 mesenter\' is conspicuous, 

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

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



mantle. X j 



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