CONTENTS 



Scheme of the Classification adopted in this Book 



MOLLUSCA 



CHAPTER I 



Introduction — Position of Mollusca.in the Animal Kincjdom — Classi- 

 fication — Origin of Land and Fresh-water Mollusca . 



CHAPTER II 



Land and Fresh - water Molli'sca, their Habits and General 



Economy 23 



CHAPTER III 



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

 tive 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 96 



CHAPTER V 



Reproduction — Deposition of Eggs — D;;vklopment of the Fertilised 

 Ovum — Differences of Skx — Dioecious and Hermaphrodite 

 Mollusca — Df.vklopmk.nt of Fresu-water Bivalves . . . 123 



