STUDIES ON!PEARL-OYSTERS | AND PEARLS.—I. 
‘The Structure of the Shell and Pearls of the 
Ceylon Pearl-Oyster (Margaritifera vulgaris 
Schumacher): with an Examination of the Cestode 
Theory of Pearl-Production. By H. LYSTER 
JAMESONY M.A., D.Sc., Ph.D., F.Z.8. 
tH if 
[rom the PROCEEDINGS OF THE ZooLoGicaL Socrery or Lonpon, 
1912.] 
[Published June 1912.] 
