LIST OF ILLUSTRATIONS xix 



FIG. PAGE 



164. Trichinella spiralis, microphotograph of cyst 304 



165. The thorn-headed worm, Gigantorhynchus hirudinaceus 307 



166. Cephalic extremity of thorn-headed worm 307 



167. The horse leech 308 



168. Ameba proteus 312 



169. Spirocheta pallida 327 



170. Hen suffering from acute spirochetosis 328 



171. Piroplasma bigeminum 348 



172. Forms of Sarcosporidia, shown in infected muscle 351 



Plates. Page 



I. Texas fever tick, male and female, with details 146 



II. Texas fever tick, stages of engorgement and details 147 



III. Evolution of the parasite of kala-azar 317 



IV. Life cycle of the malaria parasite 321 



V. Various species of Trypanosoma 331 



VI. Percheron stallion before and after development of dourine 338 



VII. Percheron mares, showing chronic dourine and last stage 340 



VIII. Coccidian Ufe cycle 344 



TABLES 



Classification of parasites of the class Insecta 20 



Life history of horse botfly, Gastrophilus equi 55 



Life history of sheep botfly, (Estrus ovis 63 



Classification of parasites of the class Arachnida 96 



Summary on nonparasitic, periods in development of Texas fever tick .... 149 



Summary on parasitic periods in development of Texas fever tick 150 



Life histories of dog tick and Texas fever tick compared 151 



Classification of parasites of the phylum Platyhelminthes 157 



Life history of liver fluke, Fasciola hepatiea 163 



Life history of beef tapeworm, Taenia saginata 172 



The principal tapeworms, with their larvse and hosts 173 



Synopsis of tapeworm larvse 194 



Life history of the gid tapeworm, Multiceps multiceps 207 



Life history of Echinococcus granulosus 213 



Classification of parasites of the phylum Coelhelminthes 222 



Life history of Trichinella spiralis 303 



Classification of parasites of the phylum Protozoa 322 



