XIV CONTENTS. 



CHAPTER XLV. 



Distribution of Molluscoida in Space Distribution of Molluscoida in 

 Time .......... PAGE 248-250 



CHAPTER XLVI. 



General Characters and Divisions of the Mollusca Proper Lamelli- 

 branchiata General Characters and Anatomy Divisions Families 

 of the Lamellibranchiata ....... 251-258 



CHAPTER XLVIL 



Encephala Gasteropoda General Characters Development Shell 

 of Gasteropoda ......... 258-262 



CHAPTER XLVIII. 



Divisions of the Gasteropoda Prosobranchiata Opisthobranchiata 

 Heteropoda Pulmonate Gasteropoda Families of the Gastero- 

 poda . .......... 262-268 



CHAPTER XLIX. 

 Pteropoda General Characters Divisions Families . . 268-269 



CHAPTER L. 



Cephalopoda General Characters Arms Respiratory Organs Re- 

 productive Process Shell Divisions ..... 269-275 



CHAPTER LI. 



Dibranchiate Cephalopods General Characters Octopoda Argonau- 

 tidse Octopodidse Decapoda Teuthidse Sepiadae Spirulidse 

 Belemnitidse Tetrabranchiate Cephalopods Structure of the Pearly 

 Nautilus Shell of the Tetrabranchiata Nautilidse Ammonitidae 

 Families of the Cephalopoda ...... 275-282 



CHAPTER LII. 

 Distribution of the Mollusca Proper in Time .... 282-284 



Tabular View of the Chief Subdivisions of the Invertebrata . 285-288 

 Glossary ............ 289 



Index . 313 



