CONTENTS. 



PART T. 



A GENERAL SURVEY OF THE TESTACEOUS MOLLUSCA. 



CHAP. I. 



Introductory Observations. — The Mollusca in general. — The Characters 

 and Analogies of the three primary Divisions or Classes ; namely, the 

 Acrita, the Radiata, and the Testacea — Notes on the Bibliography and 

 the existing Classifications of the latter - - - Page 1 



CHAP. II. 



On the Testaceous Mollusca in general, the primary Divisions, and their 

 Analogies to the Vertebrata and Annulosa - - - 26 



CHAP. III. 



On the Order of Gasteropoda, its primary Divisions, and the Characters 

 and Analogies of the Muricidce and the Turbinellids - - 53 



CHAP. IV. 



The Zoophaga, or Predaceous Shell-fish, continued. — The Family of 

 Volutida;, or Volutes - - - - - 97 



CHAP. V. 



The Predaceous Gastropods continued — The Strombidce, or Wing- 

 Shells - - - - - - -136 



CHAP. VI. 



On the Phytophagous Tribe of Shell-fish The primary Divisions or 



Families — The Helicidffi, or Land and Freshwater Snails - 158 



