viii MOLLUSCA 



CHAPTER VI 



■ESPIRATIOX AND CIRCULATION ThE MaNTLE 150 



CHAPTER Vn 



Organs of Sense: Touch, Sight, Smell, Hearing — The Foot — The 



Nervous System 177 



CHAPTER vrn 



The Digestive Organs, Jaw, and Radula: Excretory Organs . 209 



CHAPTER IX 



The Shell, its Form, Composition, and Growth — Designation of 



IIS Various Parts 244 



CHAPTER X 



Geographical Distribution of Land and Fresh-water Mollusca — 



The Palaearctic, Oriental, and Australasian Regions . . 277 



CHAPTER XI 



Geographical Distribution of Land Mollusca {continued ) — The 



Ethiopian, Nearctic, and Neotropical Regions .... 328 



CHAPTER XII 



Distribution of Marine Mollusca — Deep-sea Mollusca and their 



Characteristics ........... 360 



CHAPTER XIII 

 Class Cephalopoda ...... .o. . . 378 



