Bull. U. S. F. C. 1890. Lamellibranchiate Mollusks. (To face page 436.) 



Plate LXXIX. 



op 



i P 



Fig. I 



me 



b\J 



by. 



ilc 



8J50 



- -bv 



~ ~ilc 



me 



Kellogg del. 



