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



Plate LXXXI. 



&-'- 



\S-' 



...I 



S- 



ig- 



--.Id 



Fis. 12 



~-niu5 



Kellogg del. 



.-ec 



— -ii 



