LAMELLIBRANCHIATA 



5. External features of other Lamellibranchs. 



Mytilus. Reduced foot with byssus ; gills ; mantle containing gonads. 



Pecten. Single adductor muscle; rudimentary foot; mantle-edge with numerous eyes. 



Cardium. Elongated foot used for jumping. 



Solen. Siphons ; the two mantle-edges fused save for the slit through which the elongated foot 

 projects. 



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