COCCIDIA 473 



E. labbeana Pinto. In the gut of domef^tir ])igeon; oocysts some- 

 times light brown, 15-26ju by 14-24^. 



E. dispersa Tyzzer. In the small intestine of bob-white quail and 

 pheasant; oocysts ovate, 18.8-22.8/x (quail), smaller in pheasant, 

 without polar inclusion; sporulation in about 24 hours. 



E. ranarum (Labbe) (Fig. 219, /?). In the gut epithelium (nuclei) of 

 frogs; oocysts about 17)u b}^ 12^. 



E. prevoti (Laveran and Mesnil) (Fig. 219, /). In the gut epithelium 

 of frogs; oocysts about IT/x by 12/x; when sporozoites are fully 

 formed, the spore membranes dissolve. 



E. ranae Dobell (Fig. 219, j). In gut of frogs; oocysts 22jix bj'^ ISfx. 



E. sardinae (Thelohan) (E. oxyspora Dobell) (Fig. 219, k). In 

 the testis of sardine; oocysts spherical 30-50^. 



E. dupearum (Thelohan) {E. wenyoni Dobell) (Fig. 219, I). In the 

 hver of herrings, mackerels, and sprats; oocysts, spherical, 18- 

 33)U in diameter. 



E. gadi Fiebiger. In the s\vhn-l)ladder cf (kulus I'irens, G. morrhua, 

 and 0. aeglefinus; schizogony and sporogony; germination of spores 

 takes place in the bladder of the same host individual, bringing 

 about a very heavy infection; ooc3^sts 26-28^; pathogenic (Fiebiger). 



Genus Jarfina Leger and Hesse. Oocysts ovoid, one end rounded 

 and the other drawn out into a shoit neck; 4 spores, each with 2 

 sporozoites. 



/. paludom L. and H. (P ig. 219, m, n). In the gut cf Fulica atra and 

 Gallinula chloropus; ooc3'sts 15/i by llfx; sporulation in 15 days. 



Genus Wenyonella Hoare. Oocj'sts with 4 spores, each with 4 

 sporozoites. Three species. 



W. africana H. (Fig. 219, o, p). In the small intestine cf Boaedon 

 lineatus ("brown snake") in Uganda; oocysts ovoid or subspherical, 

 18.5-19.2/x by 16-17.6^; spores ovoid, 9.6/i by 8m; sporulation in 

 5-6 days. 



Genus Isospora Schneider. Oocyst produces 2 spores, each con- 

 taining 4 sporozoites. 



7. hominis (Rivolta) (Figs. 219, q, r; 220). This is the sole coccidian 

 parasite of man known up to the present time. Its life cycle is un- 

 known, but most probably the schizogony, gametogenesis and sexual 

 fusion occur in the intestinal epithelium. Oocysts have only been 

 seen in the stools of infected persons. 



The oocyst is asymmetrically' fusiform; 20-33^ by 10-16^; wall is 

 made up of two membranes which are highly resistant to chemicals; 

 when voided in faeces, the contents either fill up the oocyst or appear 

 as a spherical mass, composed of refractile granules of various sizes; 



