CONTENTS 



Title I 



Board of Regents Ill 



Letter of Transmittal IV 



Table of Contents V 



Statement VI 



Part I. Title ' 1 



General Introduction 3 



Habits i 3 



Economic Importance 5 



External Characters 8 



1 nternal Anatomy 17 



Plates and Explanations 23 



Part II. Title 29 



Introduction and Methods 31 



Placobdella pediculata. Habits 33 



Description 35 



Anatomy. Historical Sketch 36 



Central Nervous System 40 



Eyes 17 



Reproductiv organs 47 



Glands 49 



Nephridia 50 



Plates and Explanatii ms 53 



Tart III. Title 63 



Introduction 65 



Key to the Species 69 



Descriptions of Families &c. 



Glossiphonidce ?5 



Glossiphonia 75 



Placobdella 84 



Hemiclepsis 96 



IchthyobdellidEe 9 8 



Actinobdella 99 



Piscicola 103 



Hirudinidse 10° 



Macrobdella 1° 6 



Hsemopis ■' HO 



1 [erpobdellidae 120 



Erpobdella 121 



Nephelopsis 123 



Dina 125 



Plates and Explanations 129 



Index I 47 



