172 



SPOROZOA. 



Remarks. — This is a common parasite of cats and dogs. 

 Knowles and Das-Gupta (1934) have recorded the measurements 

 of 253 oocysts and consider the smaller oocysts, which are 

 perfectly oval and measure 23-28 ju, by 18-23 /x, as belonging 

 to " type A," which corresponds to I. rivolta (Grassi). 



Knowles and Das-Gupta (1931) also found in the csecal 

 contents of a small Indian mongoose immature oocysts of 

 a coccidium containing a single rounded unsegmented mass of 

 protoplasm, and studied its development in a moist-chamber. 

 The average dimensions of the oocyst were 20-6 ju, by 17-2^. 



Habitat. — Epithehal cells of the small intestine of cat, Felis 

 domesticus Linn. : Bengal, Calcutta ; also in the caecal 

 contents of the mongoose, Herpestes auropunctatns (Hodgs.) : 

 Bengal, Calcutta. 



102. Isospora wenyoni Ray & Das-Gupta. (Fig. 79.) 



■fisospora wenyoni, Ray & Das-Gupta, 1935 a, pp. 219-24, pi. viii. 

 Young intracellular trophozoites are found in the epithehal 



Fig. 79. — Isospora wenyoni Ray & Das-Gupta. A, merozoite entering 

 an epithelial cell ; B, merozoites escaping into the lumen 

 of the intestine ; C, microgametocyte ; D, microgametes 

 clustered round a central mass of cytoplasm ; E, macro- 

 gametocyte showing spherical nucleus and the karyosome ; 



F, macrogamete showing a recurved tail, an elongated 

 nucleus, and two microgametes near the posterior end ; 



G, mature oocyst. (After Ray and Das-Gupta.) 



