EXPLANATION OF PLATE XII 



Fossu, PELECYPOD FROM POGIBSHI ISLAND, NEAR KADIAK 

 VILLAGE, ALASKA 



FIGS, i and 2. Inoceramya concentrica gen. et sp. nov. Page 135. 

 (See also plate xni.) 



1. Gutta percha cast of the natural mold of the exterior figured 



on plate xm ; restored in outline. Natural size. 



2. Gutta percha cast of a natural mold of the interior ( x 1.5), 



showing the posterior half of the hinge and the interior rib. 



