CONTENTS 



Preface 



VII 



CHAPTER 



PART I: HOW TO KNOW SHELLS 



I How to Know Shells . . . , 



H The Balanced Aquarium and the Snailery 



PAGE 



3 

 9 



PART H: THE UNIVALVES AND CHITONS 



CLASS GASTEROPODA 



I A Typical Univalve Mollusk 



II The Murex Shells. Rock Shells 



III The Oyster Drill .... 



IV The Purples. Dog Winkles 

 V The Tritons and Frog Shells 



VI The Spindle Shells and Band Shells 



VII The Whelks. Trumpet Shells . 



VIII The Basket Shells. Dog Whelks 



IX The Chank Shells .... 



X The Volutes and Melon Shells . 



XI The Mitre Shells .... 



XII The Margin Shells .... 



XIII The OUve Shells. Rice Shells. Harp Shells 



XIV The Dove Shells .... 

 XV The Cross-barred Shells . 



21 



27 



38 

 42 



49 



56 



61 



71 

 76 



79 



87 

 89 



9' 



100 



103 



XI 



