II] WHERE PEARLS ARE FOUND 17 



adheres to the rocks by means of a muscular foot 

 just as its relation, the common limpet, does. The 

 shell has been used largely in decorations, as electric 

 light shades, etc. but does not seem much sought 

 after at present. The inhabitants of the Channel 

 Islands sometimes use it to decorate the exterior of 

 their houses. 



Finally, as a representative of quite another group 

 of molluscs, that to which the cuttlefishes belong, we 

 must add that pearls are found in the pearl Xautilus 

 of the tropics. 



This list is by no means an exhaustive one but it 

 will serve to indicate some of the shellfish in which 

 pearls occur and the countries in Avhich they are to 

 be found. 



CHAPTER III 



THE ANATOMY OF THE PEARL OYSTER MARGARI- 

 TIFERA VULGARIS, SCHUM., AND THE STRUCTURE 

 OF ITS SHELL 



A SIMPLE account of the anatomy and biology of 

 the Ceylon pearl oyster is interesting and necessary 

 to any who would follow further the romance of 

 pearl formation. 



