CONTENTS. 



PART I. 



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 Muricidas and the Turbinellidae - -53 



CHAP. IV. 



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



Volutids, or Volutes - - 97 



CHAP. V. 



The Predaceous Gastropods continued The Strombidse, or Wing- 

 Shells - - 136 



CHAP. VI. 



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

 Families. The Helicidae, or Land and Freshwater Snails - 158 



