TOXOPLASMA. 203 



is known about the life-history. Calkins (1926) provisionally- 

 regarded it as a subgenus of Babesia, while Wenyon (1926) 

 placed it among parasites of doubtful nature. Reichenow 

 (1929) placed the genus as an addendum to the family Eimeridse, 

 as, according to NoUer, certain stages found in the wall of 

 the ahmentary canal of birds may be interpreted as schizonts, 

 microgametocytes, and macrogametes of the type found in 

 that family. Noller (1931) thinks that they should most 

 probably be placed in the neighbourhood of the Coccidia 

 occurring in the blood. Kudo (1931) and Calkins (1933) 

 have altogether excluded them from consideration. 



Key to Indian Species. 



1 (8). Schizogony known to occur 2. 



2 (7). Schizonts not diHerentiated 3. 



3. Form circular or pointed, 3-7 /x ; schizo- 



gony in the Uver-eells, more rarely in 



peripheral blood or bone-marrow ; 



sometimes binary fission. In leuco- [Kohl-Yak., p. 204. 



cytes of pigeon T. colwmbee Yak. & 



4. Smaller forms ring-like ; schizonts 



showing signs of binary fission. In [p. 203. 



Butastur T. butasturis de Mello, 



5. Form, crescentic, pointed at both ends, 



reproduction by binary fission or 



schizogony. In smears from internal [p. 205. 



organs of rabbit T. cuniculi Splendore, 



6. Form semilunar or oval. In cells of [p. 204. 



internal organs of dog T. canis Ugo Mello, 



7 (2). Schizonts and merozoites of two kinds : 



form ovoid, fusiform or falciform. 



In leucocytes or endothelial cells of [p. 206. 



lung of coot T. fulicse de Mello, 



8 (1). Schizogony not known, even animal 



natm-e doubtful. Form round, ovoid 



or pyriform. In blood and spleen of [lani, p. 207. 



man T. {!) pyrogenes Castel- 



139. Toxoplasma butasturis de Mello. 



■f Toxoplasma butasturis, de Mello, 1937 a, p. 111. 



Small parasites resemble the ring-forms of Plasmodids, 

 larger schizonts with the nucleus better formed and showing 

 evidence of binary fission. Often more than one parasite 

 in the same host-cell. 



Bemarks. — The organism differs from T. fulicsa in that 

 the cytoplasm is stained uniformly pale rose and does not 

 show two types of coloration suggestive of sexual differentia- 

 tion. It resembles T. columhse Yakimoff & Kohl-Yakimoff, 

 of the pigeon. 



Habitat. — Leucocytes of Butastur teesa (FrankHn) : Portu- 

 guese India. 



