V1U CONTENTS. 



CHAPTER IV. 



MUTUALISTS. 



PACE 



Definition — Ricinidae — Trichodectes of Dog harbouring Larva of 

 Taenia — Arguli — Caliguli — Ancei — Pranizas— Cyami — Nematode 

 Mutualists — Strange form of Histriobdellav-^-Egyptian Distome 

 in Man 68 



CHAPTER V. 



PAKASITES. 



Distinction between Parasites and Oarnivora — Parasites found on all 

 Classes of Animals — Males dependent on Females — Parasites on 

 Man— Abundant Parasites in Stork — All the Organs nourish 

 Parasites — Different size of Male and Female — Lerneans — 

 Diplozoa — Migration of Parasites — Corresponding Changes of 

 Form — Parasites restricted to certain Regions — Former Theory 

 of Spontaneous Generation 85 



CHAPTER VI. 



PARASITES FREE DURING THEIR WHOLE LIFE. 



Leeches — "Vampires— Cylicobdellse — Branchellions — Gnats — Black- 

 flies— Mosquitoes — Gnats in high Latitudes— Tsetse — Ox-flies — 

 Pteropti — Nycteribise — Bugs — Lice — Fleas — Itch Insect — Acari 

 on Beetles and Bees — Cheyletus eruditus 107 



CHAPTER VII. 



PARASITES FREE WHILE YOUNG. 



Isopod Parasites — Chigoe — Ticks — Pigeon-mite — Bopyridse — Ich- 



thoxenus — Peltogasters — Tracheliastes — Penellse — Lerneans ' 



Guinea-worm — Leptodera of Snail — Nematodes in Bones 



Lichnophorse — Gregarinse 138 



CHAPTER VIII. 

 PARASITES THAT ARE FREE WHEN OLD. 

 Utility of Ichneumons — Scolise of Tan-beetles — Scolyti of Seychelles 

 Cocoa-nut Trees — Elms at Brussels destroyed by Scolyti 



