CONTENTS 



Scheme of the Classification adopted in this Book 



MOLLUSCA 



CHAPTER I 



Introduction — Position of Mollusca in the Animal Kingdom 

 Classification — Origin of Land and Fresh-water Mollusca 



CHAPTER II 



Land and Fresh-water Mollusca, their Habits and General 



Economy 23 



CHAPTER III 



Enemies of the Mollusca — Means of Defence — Mimicry and Pro- 

 tective Coloration — Parasitic Mollusca — Commensalism — 

 Variation 56 



CHAPTER IV 



Uses of Shells for Money, Ornament, and Food — Cultivation of 

 the Oyster, Mussel, and Snail — Snails as Medicine — Prices 

 GIVEN FOR Shells 90 



CHAPTER V 



Reproduction — Deposition of Eggs — Development of the Fertil- 

 ised Ovum — Differences of Sex — Dioecious and Hermaphro- 

 dite Mollusca — Development of Fresh-water Bivalves . . 123 



vii 



