CHAPTER IX. 



SOME COMMON INTERNAL PARASITES OF DOMESTIC 

 ANIMALS 1 . 



IN the previous chapters frequent reference has been 

 made to the parasites usually associated with the several 

 animals that have been dealt with. We will now discuss 

 a few of those which are of general interest, inasmuch as 

 they affect domestic animals and are therefore of economic 

 importance. 



Protozoa (Unicellular Animals). 



A parasite of microscopic size that at times causes 

 serious disease and loss among rabbits is the Protozoon 

 Coccidium oviforme. As the specific name implies the 

 organisms are of an oval shape : their length is 40 49 /*, 

 their breadth 22 28//,. They occur in enormous numbers 

 in the liver and bile-passages of infected animals. The 



1 For detailed treatment of this subject vide Traite de ZooL, Medic, 

 et Agric. , 2nd ed. Paris ; United States' Dep. Agric. Bureau of Anim. 

 Indust., Bulls, ix. xn. ; Zoologie Agricole, Railliet ; Compendium der 

 Helminthologie, von Linstow, Hannover, 1878 ; Zeit. f. d. ges. Naturw. 

 Giebel, LIV. 1881 ; Eiehm., Animal Parasites and Messmates, Internat. 

 Sci. Ser. xix. 1876. 



