CONTENTS. 



PAGE 



Table of the Sub-kingdoms and Classes of Animals 2 



INTRODUCTION. 



CHAPTER I. 



ON THE POSITION of THE MOLLTJSCA IN THE ANIMAL KINGDOM. 

 Characters of the four primary groups ; Vertebrata 

 Mollusca Articulata Radiata. Their equal antiquity ... 3 



CHAPTER II. 



CLASSES or THE MOLLTJSCA. 1. Cephalopoda. 2. Gasteropoda. 

 3. Pteropoda. 4. Brachiopoda. 5. Conchifera. 6. 

 Tunicata 6 



CHAPTER III. 



HABITS AND ECONOMY or THE MOLLUSCA. Sedentary tribes, 

 their mode of attachment ; locomotive tribes, their means 

 of progression ; situations frequented by shell -fish. Food : 

 vegetable- infusorial- and animal-feeders. Use of shell-fish 

 to other animals for food ; use of shells for ornamental and 

 other purposes ; prices of shells. Duration of molluscous 

 animals ; tenacity of life ; fecundity ; oviposition 10 



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