XU CONTENTS. 



CHAPTER IV.— ITematoda. 



The order of round worms, or ISTematoda — Aspect, habits, and distribution — Probable 

 number of known species — Classification — Anguillulidffi — The common vinegar eel 

 as a type — Genera — Gordiidse, or family of hair-worms — Dujardin's account of the 

 structure of Mennis nigrescens — The views of Meissner, Yon Siebold, and Van Be- 

 neden respecting the development of Mermis — Genera — Structure of Sphserularia — • 

 Oxyuridffi, or thread-worms — Organization of Oxyuris eurvula—Qenera, . P. 52 — 67 



CHAPTER v.— Nematoda. 



The Filaridge — Trichocephalus affinis considered as a type — Wilson's investigations 

 respecting its anatomical structure — The views of Kiichenmeister and of Eberth 

 regarding the characters presented by the reproductive organs, compared with 

 those severally entertained by Mayer, Eberth, and the Author — Embryonic develop- 

 ment — Genera — Simondsia paradoxa — Cheii'acanthidfB — Genera — Ascaridse — Genera. 



68—82 



CHAPTER VI.— Xematoda. 



Strongylidse — Genera — The Sclerostoma syngamus as a type, with a jDarticular account 

 of the gape disease which it occasions— Structure and development — Remedial 

 methods — The genvxs Prosthecosacter — Organization of Prosthecosacter convolutus — 

 Mode of reproduction — CucuUanidse — Genera ...... 83 — 96 



CHAPTER VII.— Acanthocephala. 



Acanthocephala or Thorn-headed worms — General characters and distribution — Classi- 

 fication — Organization of Echinorhynchus antJiuris. Singular mode of egg-forma- 

 tion— Leuckart's researches respecting the development of Echinorhynchus proteus — 

 His discovery of the so-called phenomenon of " alternate generation" in this 

 class of parasites 97 — 103 



CHAPTER VIII.-Cestoda. 



Cestoda or Tapeworms — General characters and habits — Distribution in mammals, birds, 

 reptiles, and fishes — Estimated number of species — Tasniadas — Particular account of 

 the development of Cysticercus pisiformis from the eggs of Tcenia serrata, and also 

 of the adult tapeworm from the Cysticercus —Constitution of the "zoological indi- 

 vidual" — Genera ............ 104 — 11-5 



