300 SPOROZOA. 



combination of a number of morphological and clinical features. 

 They consider the forms studied by them to be two types of 

 a new species and give their differential characters alongside 

 those given in du Toit's table of previously known species. 

 The examination of blood taken at the first rise of temperature 

 frequently reveals the presence of few parasites and Koch's 

 " blue bodies " or both, but, as the disease advances, the 

 parasites rapidly increase in number and may eventually invade 

 50 to 100 per cent, of the red blood-corpuscles, although 

 Koch's " blue bodies" may vary in number from " rare " to 

 " numerous." 



Sen and Srinivasan also came to the conclusion that the 

 infection in imported Friesian bulls is exotic in origin, being 

 probably acquired by the animals during the course of their 

 voyage to India, and the parasite concerned is Theileria 

 annulata. 



Habitat. — Blood of Indian hill buUs, Bos indicus Linn. : 

 United Provinces, Muktesar. 



251. Theileria cellii (Castellani & Chalmers). 



■f Babesia cellii, Castellani & Chalmers, 1910. 

 Theileria cellii, Castellani & Chalmers, 1919, p. 500. 

 Babesia cellii, Wenyon, 1926, p. 1027. 



Bacillary and pear-shaped forms, l3dng side by side in the 

 red blood- corpuscles. Development not known. 



Remarks. — This form was originally described as Babesia 

 cellii by Castellani and Chalmers, but in the third edition of 

 their work they substituted the name Theileria cellii without 

 giving any further details. It is by no means clear from the 

 original description whether the form should be referred to 

 Babesia or to Theileria. 



Habitat.' — Blood of Macacus pileatus (Shaw) : Ceylon. 



252. Theileria hirci Dschunkovsky & Urodschevich. (Fig. 146.) 



Theileria hirci, Dschunkovsky & Urodschevich, 1924, pp. 108-10, 

 fig. A, 1-24 ; Wenyon, 1926, pp. 1036-8, fig. 430 ; Reichenow, 

 1929, p. 1026 ; Thomson & Hall, 1933, p. 228. 

 Theileria ovis, Lestoquard, 1924, pp. 122-8, 15 figs. 

 ■\Theileria ovis, Edwards, 1926, p. 43. 

 Theileria ovis, du Toit, 1931, p. 556. 

 ■fPiroplasma taylori, Sarwar, 1935, pp. 172-5, pis. v, vi, via, vii. 

 Theileria hirci, Reichenow, 1935, p. 378 ; Bhatia, 1936, pp. 151-4. 



Parasites mostly small and variable in shape, some being 

 distinctly ring-shaped, others bacillary or nail-like, oval or 

 pyriform ; occurring singly, in twos or, rarely, in threes in the 

 centre of the red blood-corpuscle. Cross-like forms also occur, 

 each member being pyriform. Extracellular forms, similar 

 to Koch's " blue bodies," encountered in peripheral blood, 

 were round or oval, at times as large or larger than a blood- 



