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CONTENTS. 



Class Third — Cirripeda, 

 Order I. — Pedunculata, 

 II. — Sessilia, 

 Division III. — Articulata, 

 Class Fifth. — Anndlosa, 



Order I. — Sedentaria, . 



II Anteiinata, 



III. — Apoda, 



On the Structure of the Mollusea, 



Class I. — Cephalopoda, 



Class II. — Pteropoda, . 



Class III — Gasteropoda, 



Order I. — Gasteropoda Pulmonata, 



II. — Gasteropoda Pectinibranchiata, 

 III — Gasteropoda Tubulibranchiata, 

 IV. — Gasteropoda Scutibranchiata, 

 V — Gasteropoda Cyclobranchiata, 

 VI. — Gasteropoda Inferobranchiata, 

 VII. — Gasteropoda Tectibranchiata, 

 VIII. — Gasteropoda Nudibraiichiata, 

 IX. — Gasteropoda Heteropoda, 

 X. — Gasteropoda Cirrobranchiata, . 



Class IV. — Acephala, or Lamellibranchiata, 



Class V. — Brachiopoda, .... 



Class VI — Tunicata, 



Explanation of the Figures, .... 

 Directions for Collecting, Cleaning, and Arrang 



Shells, 



Glossary of Terms used in Conchology, 

 Index to the Classes, Orders, and Genera, 



mg 



