THE BIVALVE SHELL 



ft. ITS PARTS 



Prepared by P. J. R 



E. C. Pholfcegnat. , V 1 1'' < \ - c 



A t jj^ l c/ ( ?tt^ jBiydklye; Shell, and its parts. 



Biibwing ihe Margins, Eidges, Umbones, Ligament, Linula, 



Ears, Accessory Plates, and the Periostracum. 



(All one-third nat. size.) 



