THORNY OYSTERS AND OTHERS 



1 Royal Thorny Oyster, Spondylus regius. 



2 Twisted Ark Shell, Area torluosa. 



Hemicardium sp. 5 Nicobar Thorny Oyster, Spondylus Nicobaricus. 



Im[»erial Thorny Oyster, Spondylus imperialis. 



