CONTENTS, 
CHAPTER I. 
PAGE 
INTRODUCTION; OBJECT AND NATURE OF ZOOLOGICAL 
CLASSIFICATION ; CLASSES OF THE MOLLUSCOUS 
ANIMALS ........ 1 
CHAPTER II. 
Bivalves :— 
I. STRUCTURE AND PHYSIOLOGY OF THE CONCHIFERA 10 
II. DESCRIPTION OF SPECIES ..... 20 
FAMILY MYTXLIDiE..20 
„ unioniDjE (fresh-water mussels) . 25 
„ cycladidae .... c . 32 
CHAPTER TIL 
Water-breathing Snails .... .34 
I. STRUCTURE AND PHYSIOLOGY OF THE GASTERO¬ 
PODA 
44 
