2 3 2 



ANIMAL PARASITES 



oocysts which divide into numerous sporoblasts, changing into sic- 

 kle-shaped sporozoites upon liberation. 



The coccidia are easily demonstrable in tissue and in feces. They 

 produce in man occasionally a fatal disease infecting the liver and 

 intestines. Cattle sometimes die from haemorrhagic dysentery due 



FIG. 84. Development of coccidium cuniculi: #, b, c, young coccidia in epi- 

 thelial cells of gall duct; d, e,f, fully grown encysted coccidia; g, h, i k, I, show- 

 ing development of spores; m, isolated spore, greatly magnified, showing the 

 two falciform bodies (pseudonavicella; sporozoites) in natural position; n, a spore 

 compressed so as to separate the two sporozoites, o, a sporozoite or falciform 

 body with y, its nucleus. (From Railliet after Balbiani in Tyson's Practice.) 



to one of the coccidia. The disease is transmitted by the ingestion 

 of food contaminated by feces containing the sporozoites. 

 Acid fuchsin stains the sporozoa. 



BABESIA OR PIROPLASMA BIGEMINA. 



A protozoon supposed to be the cause of spotted fever in the valley 

 of the Bitter Root river, Montana. This cattle disease is a febrile 

 one characterized by an irregular fever range, by muscular pains, 



