LIST OF ILLUSTRATIONS xix 



FIG. PAGE 



164. Trichiuella spiralis, microphotograph of cyst 304 



165. The thorn-headed wonii, Gigautorhjnichus hirudinaceus 307 



166. Cephalic extremity of thorn-headed wonn 307 



167. The horse leech 308 



168. Anieba proteus 312 



169. Spirocheta palhda 327 



170. Hen sufTering from acute spirochetosis .• 328 



171. Piroplasma bigeminum 348 



172. Fonns 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 



YI. Percheron stallion before and after development of dourine 338 



VII. Percheron mares, sho\\'ing chronic dourine and last stage 340 



VIII. Coccidian life 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 



Sunmaary on nonparasitic periods in de^•elopment of Texas fever tick 149 



Sunmiary 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 Platyhehninthes 157 



Life history of liver fluke, Fasciola hepatica 163 



Life history of beef tapewonn. Taenia saginata 172 



The principal tapewomis, with their larvfe and hosts 173 



Synopsis of tapewonn larvse 194 



Life history of the gid tapewonn, 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 



