BABESIA. 



307 



255. Babesia eaballi (Nuttall & Strickland). (Fig. 149.) 



Piroplasma sp., Marzinowsky & Bielitzer, 1909, pp. 28-31, pis. v— 



vii. 

 Piroplasma caballi, Nuttall & Strickland, 1910, pp. 524r-5 ; 1912, 



pp. 65-96, pi. iii, 8 diagrams and 5 charts ; Dschiinkovski 



& Luhs, 1913, pp. 289-302, pis. xiv, xv ; Darling, 1913, pp. 197- 



203, pi. iii ; Carpano, 1913 b, pp. 13-41, 3 pis. 

 ■\Piroplasma caballi, Valladares, 1914, pp. 88-94. 

 Piroplasma caballi, Yakimoff, Schokhor, & Koselkine, 1917, 



pp. 302-11 ; Vein, 1922, pp. 197-212, fig. 27. 

 Babesia caballi, Wenyon, 1926, p. 1008, pi. xviii, 21-25, & fig. 415 ; 



Knowles, 1928, p. 453, fig. 105, 22-30; Reichenow, 1929, 



pp. 1036-8. 



Parasites relatively large, and resemble B. bigemina found 

 in cattle. Multiplication takes place by budding, and pear- 

 shaped forms occur in pairs in the red blood- corpuscles. 



-Babesia caballi (Nuttall & Strickland). A, pear-shaped 

 form ; B-D, stages in the process of budding ; E, a pair 

 of pear-shaped individuals. (After Nuttall and Strick- 

 land.) 



Remarks. — This form, like B. equi (Laveran, 1901), causes 

 hsemoglobinuric fever in horses. Nuttall and Strickland 

 (1910) showed that two distinct species occur in horses. 

 They placed the small form, previously known as Piroplasma 

 equi Laveran, in a new genus under the name Nuttallia equi, 

 and described the larger form as Piroplasma caballi. Later 

 (1912) they described the method of multipHcation of the latter 

 in the blood. 



Marzinowsky and BieUtzer (1909) showed that the tick, 

 Dermacentor reticulatus Koch, was the vector in South Russia, 

 and Carpano (1913 b) thought that Margaropus annulatus 

 (Say) was the vector in Italy. 



Habitat. — Blood of the horse, Equus caballus Linn. : 

 Madras, Madras. 



256. Babesia canis (Plana & GalH-Valerio). (Figs. 150, 151.) 



Pyrosoma bigeminum var. canis, Piana & Galli-Valerio, 1895, 



p. 345. 

 Piroplasma canis, Labbe, 1899, p. 124 ; Lounsbtuy, 1901, p. 714 ; 



Minchin, 1903, pp. 242, 270, 337, 350 ; Lounsbury, 1904, p. 113 ; 



Nuttall, 1904, pp. 219-57, 7 figs. & 7 charts. 



x2 



