CONTENTS. 



INTRODUCTION. 



Internal Structure of the Mollusca — Respiration — Loco- 

 motion — Rei^roduction 1 



CHAPTER I. 



Number and Distribution of Britisb Mollusca — Classi- 

 fication — Bivalves and Univalves — Aquatic and 

 Terrestrial Univalves — The Commoner Forms of 

 Shells . 9 



CHAPTER II. 



A Ramble over the London Clay — Shells in London 

 Gardens — Medicinal Pi'operties of Snails — The 

 Common Garden Snail a Musician — Other Garden 

 Snails — Snails in Hyde Park — River-side Species — 

 The Shell-slug 19 



CHAPTER III. 



The London Clay continued — Shells in London Waters 

 — Mussels — The Pearl Mussel — The Painter's Mus- 

 sel — The Swan Mussel — The Zebra Mussel — Pond 

 and River Shells ....... 34 



