254 



ANIMAL PARASITES 



The coccidia are easily demonstrable in tissue and in faeces. 

 They produce in man occasionally a fatal disease infecting the 

 liver and intestines. Cattle sometimes die from haemorrhagic 



FIG. 80. Development of coccidium cuniculi: a, b, c, young coccidia in epi- 

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

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

 the two falciform bodies (pseudonawcdla; sporozoites} in natural position; n, a 

 spore compressed so as to separate the two srjorozoites, o, a sporozoite or 

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

 Practice.) 



dysentery due to one of the coccidia. The disease is transmitted 

 by the ingestion of food contaminated by faeces containing the 

 sporozoites. 



Acid f uchsin stains the sporozoa. 



