CONTENTS. 



PART I. 



SYSTEMATIC HBLMINTHOLOGY. 



CHAPTER I.— TUEBELLAMA. 



Nature and extent of the subject— Leading terms employed— The Entozoa constitute a 

 peculiar /aMwo — Their distribution throughout time and space — ^Not yet found in a 

 fossil state — ClassiScation of the Helminths — A new sub-class proposed — The Tur- 

 beUarians — Characters of the Planaridse — Grenera — The Nemertidse, or ribbon 

 worms — Their structure and habits — Grenera — Concluding argument in favour of 

 associating the TiirbeUarians with the Helminths in the manner here proposed. 



P. 2—13 



CHAPTER II.— Tbematoda. 



The Trematoda, or flukes — Aspect and habits— Distribution in mammals, birds, reptiles, 

 and fishes— Estimated number of species — Classification of the order — The family of 

 Monostomes — Their development and genera — The Distomes — Their anatomical 

 structure and development — ^Van Beneden's investigations respecting Distoma mili- 

 tare — Pagenstecher's researches — Genera 14 — 32 



CHAPTER III.— Teematoda. 



Structure of particular Trematode types — Fasciola — Grasterostoma — Campula — BUharzia 

 — ^Echinostoma — Family of the Tristomes — Their development and Genera — The 

 Polystomes — Genera — The Gjrodactyles — Wedl's researches I'especting their orga- 

 nization — Development — Von Siebold's ,and Van Beneden's opinions contrasted. 



33-51 



