COCCIDIA 475 



/. rivolta (Grassi) (Fig. 219, t). In the gut of cat and dogs; oocysts 

 20-25m by 15-20^. 



I. felis Wenyon (Fig. 221, a). In cat and dog; oocysts 39-48^ by 

 26-37m. 



I. suis Biester. In swine faeces; oocysts siibspherical, about 

 22.5/i by 19.4^t; sporulation in 4 days. 



I. lacazei Labbe. In small intestine of passerine birds (sparrows, 

 blackbirds, finches, etc.); oocysts subspherical, 18.5-30^ by 18- 

 29.2)u; heavily infected sparrow shows definite symptoms; sporula- 

 tion in 4-5 days. 



/. lieberkuhni (Labbe) (Fig. 221, h). Oocyst about 40m long; in the 

 kidney of frogs. 



Genus Cyclospora Schneider. Development similar to that of 

 Eimeria; oocyst with 2 spores, each with 2 sporozoites and covM'ed 

 by a bi-valve shell. 



C. caryolyfica Schaudinn (Fig. 221, c). In the gut of mole; sporo- 

 zoites enter and develop in the nuclei of gut epithelial cells; oocyst 

 oval, about 15m by 11.5^l. 



Genus Dorisiella Ray. Zygote develops (without becoming oocyst) 

 into 2 spores, each with 8 sporozoites; macrogametocytes migratory. 



D. scolelepidis R. (Fig. 221, ci). In the gut of Scolelepis fuUginosa; 

 zygote contents divide into 2 oval spores, 12-16m by 6-10^; spore 

 with 8 sporozoites. 



Genus Caryospora Leger. Oocyst develops into a single spore 

 with 8 sporozoites and a residual mass; membrane thick and yellow. 

 One species. 



C. simplex L. (Fig. 221, e,f). In the gut-epithelium of Vipera aspis; 

 < cyst thick-walled, 10-15^ in diameter. 



Genus Cryptosporidium Tyzzer. Lumen-dwelling minute organ- 

 ms; oocyst with 4 sporozoites. 



C. muris T. (Fig. 221, g, i). In the peptic glands of the mouse; both 

 schizogony and sporogony in the mucoid material on surface of the 

 epithelium; oocysts 7m by 5m; 4 sporozoites, 12-14m long. 



C. parvum T. In the glands of small intestine of the mouse; oocysts 

 with 4 sporozoites, 4.5m in diameter. 



Genus Pfeififerinella Wasielewski. Macrogamete with a "recep- 

 tion tubule" by which microgamete enters; oocyst produces directly 

 8 sporozoites. 



P. ellipsoides W. (Fig. 221, j). In the liver of Planorhis corneus; 

 oocysts oval, 13-15m long. 



P. impudica Leger and Hollande (Fig. 221, k). In the liver of 

 Limax marginafiis; oocysts ovoid, 20m by 10m. 



