CONTENTS. 



CHAPTER I. 



Page 



The name of Mollusca given by Cuvier — Great multitudes of these 

 creatures — Striking organic differences, modes, and appearances — Uni- 

 formity of plan in other cases — Explanation of the term Mollusca — 

 Nervous system and senses of these animals — Systematic and pulmo-- 

 nary circulation — The heart — Differences of the part called the mantle 

 — Its secretion of an external shell — The mouth variously adapted 

 to circumstances — Different means employed to bring food to this 

 organ — The cilia — The simple and the complex stomach — The power 

 of locomotion — Carious structure and use of the foot — The Mollusca 

 a part of the provision made for various other creatures— Classification 

 of the Mollusca 1 



CHAPTER II. 



Aim of the writer — The Cirrhopoda — The Barnacle — Its structure de- 

 scribed — Use of its arms — Extraordinary transformation of the young — 

 Strange fable relative to the Barnacles, or Wild Geese — Ignorance of 

 natural history once prevalent — The Balanus of the Tortoise . . .18 



