EXPLANATION OF PLATE XV. 



Margaritanopsis woodthorpi n. sp. 



EiG. I. — Left valve (outside), nat. size. 

 ,, 2.— ,, ,, (inside), ,, ,, 

 ,, 3.— Right valve (inside), ,, ,, 

 ,, 4. — Viewed from above, ,, ,, 



