EXPLANATION OF PLATE XII 
Fossil. Pelecypod from Pogibshi Island, near Kadiak 
Village, Alaska 
Figs, i and 2. Inoceramya concentrica gen. et sp. nov. Page 135. 
(See also plate xm.) 
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. 
