TABLE OF CONTENTS 



Page 



INTRODUCTION 1 



TAXONOMY 2 



DISTRIBUTION -2 



Fossil Distribution 2 



Recent Vertical Distribution 3 



Recent Horizontal Distribution 3 



General 3 



Specific 4 



Eastern Coast of North America 5 



Eastern Canada 5 



Maine 5 



- Massachusetts 6 



Rhode Island 7 



" Connecticut 7 



New York 7 



New Jersey 8 



Maryland 9 



Virginia 9 



Southern States 10 



North Carolina '11 



South Carolina ll 



Georgia 11 



Florida 12 



Northern coast of the Gulf of Mexico 12 



Bermuda 12 



Western Coast of North America 12 



California 12 



Oregon 14 



Washington 14 



Western Canada 14 



Great Britain 14 



Other Areas 16 



Temporal Distribution 16 



ABUNDANCE 17 



FORM AND FUNCTION 17 



General 17 



Nervous System 20 



Circulatory System 20 



Locomotory System 21 



Drilling and Feeding Organs 22 



Excretory System 25 



Reproductive System 26 



