TABLE OF CONTENTS 



DEFINITION OF OLIGOCHAETA 



PAOE 



I 



PART I.— THE ANATOMY OF THE OLIGOCHAETA. 



HisTOBiCAii Note . . . . . 



The Body-wall and Exteenal Chaeactees 

 The Neetotjs System . 



COELOM 



Nepheidia 

 Alimentaey Canal 

 Vasculae System 

 Blood-glands 

 Eespieatoet Oegans . 

 Eepeoductive System . 

 Gbogeaphical Disteibution 



I 



2 



i8 

 25 

 31 

 53 

 64 



77 



8i 



84 



148 



PART II.— SYSTEMATIC. 



The Classification op the Oligochaeta 155 



Phylogenetic Aeeangement oe the Oligochaeta . : . . . . . 162 



Desceiptions op Geneea and Species 174 



Geoup Apeaneuea 176 



Family Aeolosomatidae 176 



Geoup Miceodeili 187 



Family Pheeoeyctidae 187 



Family Moniligasteidae 192 



b 



