CONTENTS. 



BIVALVES. 



The Oyster 74 



Pearls • • 87 



The Mussel a^d the Cockle . , • • 92: 



Scallop Shells 102: 



Limpets 105 



EOCK-BORERS 108- 



MULTIVALVES. 



The Chitons . Ill 



Barnacles ..,,.,.. 113^ 



Cuttle-Fish IID 



Nautilus and Aii:joNiTE 124 



SHELLS OF COMMON OCCURRENCE. . IGG 



