CONTENTS. 



Page. 



CHAPTER I. 

 CONSTRUCTION OF SHELLS 1 



CHAPTER IL 

 GROWTH AND HABITATION 9 



CHAPTER III. 

 GEOGRAPHY OF SHELLS 28 



CHAPTER IV. 



CEPHALOPODS 39 



CHAPTER V. 

 GASTROPODS 61 



CHAPTER VI. 



FAMILIES OF PECTINIBRANCHS 73 



PULMOBRANCHS 16ff 



NUCLEOBRANCHS 194 



PLEUROBRANCHS 196 



CERVICOBRANCHS 202 



CYCLOBRANCHS 217 



CIRROBRANCHS 235 



