584 



PROTOZOOLOGY 



testis of sardine; spherical oocyst 30-50/u (Thelohan, 1890; Dobell, 

 1919). 



E. clupearum (Thelohan) (E. wenyoni Dobell) (Fig. 248, s). In the 

 liver of herring, mackerel, and sprat; spherical oocysts 18-33^ in 

 diameter (TMohan, 1894; Dobell, 1919). Taxonomy (Thomson and 

 Robertson, 1926). 



E. gadi Fiebiger. In the swim-bladder of Gadus virens, G. morrhua, 

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

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

 about a very heavy infection; oocysts 26-28 m; pathogenic (Fiebiger, 

 1913). 



E. brevoortiana Hardcastle (Fig. 248, t). Schizogony in the epithe- 

 lium of the pyloric caeca and sporogony in the testis of the men- 

 haden, Brevoortiana tyrannus; mature oocysts, spherical, 17.5-30> 

 in diameter or ovoid, 21-30/x by 15-27. 5m (Hardcastle, 1944). 



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

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

 sporozoites (Leger and Hesse, 1922). 



J. paludosa L. and H. (Fig. 251, a, b). In the gut of Fulica atra and 

 Gallinula chloropus; oocysts 15/x by 11/x; sporulation in 15 days. 



Fig. 251. Oocysts of Coccidia. a, b, Jarrina paludosa, X800 (Leger 

 and Hesse) ; c, d, oocyst and spore of Wenyonella africana, X 1330 (Hoare), 

 e, f, a young and a mature oocyst of Isospora hominis, XI 400 (Dobell); 

 g, /. bigemina; h, /. rivolta, X930 (Wenyon). 



Genus Wenyonella Hoare. Oocysts with 4 spores, each with 4 

 sporozoites. Three species. 



W. africana H. (Fig. 251, c, d). In the small intestine of Boaedon 

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

 18.5— 19.2/u by 16-17. 6/x; spores ovoid, 9.6^ by 8yu; sporulation in 

 5-6 days. 



W. gallinae Ray. In the epithelium of the lower intestine of chick- 



