COCCIDIA 427 



schizogony and sporogony in the mucoid material on surface of 

 the epithelium; oocysts 7^ by 5/z; 4 sporozoites, 12-14ju long. 



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

 with 4 sporozoites, 4.5ju in diameter. 



Genus Pfeifferinella Wasielewski. Macrogamete with a "recep- 

 tion tubule" by which microgametes enter; oocyst produces di- 

 rectly 8 sporozoites. 



P. ellipsoides W. (Fig. 193, j). In liver of Planorhis corneus; 

 oocysts oval, 13-15^ long. 



P. im-pudica Leger et Hollande (Fig. 193, k). In liver of Limax 

 marginatus ; oocysts ovoid, 20jU by 10^. 



Genus Lankesterella Labbe. Oocyst produces 32 or more spo- 

 rozoites directly without spore-formation; in endothelial cells of 

 cold-blooded vertebrates; mature sporozoites enter erythrocytes 

 in which they are transmitted to a new host individual by blood- 

 sucking invertebrates. 



L. minima (Chaussat) (Fig. 193, T). In frogs; transmitted by 

 leeches (Placohdella marginata) ; frog acquires infection through 

 introduction of sporozoites by leech; sporozoites make their way 

 into the blood capillaries of various organs; there they enter en- 

 dothelial cells; schizogony produces numerous merozoites which 

 bring about infection of many host cells; finally macro- and mi- 

 cro-gametocytes are formed; anisogamy produces zygotes which 

 transform into oocysts, in which a number of sporozoites develop ; 

 these sporozoites are set free upon disintegration of cyst wall in 

 the blood plasma and enter erythrocytes (Noller); oocyst oval, 

 about 33^1 by 23ju. 



Genus Schellackia Reichenow. Oocyst spherical with 8 sporo- 

 zoites, without spore membrane; in gut of lizards. 



S. holivari R. In mid-gut of Acanthodactylus vulgaris and Psam- 

 modromus hispanicus; development similar to Eimeria schuhergi 

 (Fig. 188); oocysts, spherical, 15-19/^ in diameter, with 8 sporo- 

 zoites. 



Genus Barrouxia Schneider. Oocyst with numerous spores, 

 each with a single sporozoite; spore membrane uni- or bi-valve, 

 with or without caudal prolongation. 



B. ornata S. (Fig. 193, m). In gut of Nepa cinerea; oocysts 

 spherical, 34-37/x in diameter, with many spores; spore with one 

 sporozoite and bivalve shell, 17-20ai by 7-lOju. 



Genus Echinospora Leger. Oocyst with 4-8 spores, each with a 



