1911.] The Morphology of Trypanosoma evansi (Steel). 187 

 Table III. 



Species. 



Posterior i Micro - 

 extremity to nucleus to 

 micro-nucleus. | nucleus. 



Length 



of 

 nucleus. 



Nucleus to 



anterior 

 extremity. 



Free 

 flagellum. 



Total 



Bruoei 



Evansi 



1-5 ! 5-8 

 1-5 1 5-9 



2-8 

 2 5 



10 -o 



10-4 



3- 3 



4- 



23-4 

 24 -3 





Microns. 



But, as we have seen, if a curve is made of the distribution of length 

 among individuals of the species Trypanosoma evansi and compared with 

 a similar curve of Trypanosoma brucei, then the difference between the two 

 is striking. 



DESCRIPTION OF PLATE 5. 



Trypanosoma evansi from the blood of various animals, fixed osmic acid, stained Giemsa. 

 X2000. 



Note the similarity in appearance between this trypanosome and Trypanosoma brucei.* 

 The nucleus is oval, or round, and is placed near the middle of the body. The micro- 

 nucleus is small and round. One short and stumpy trypanosome, without free flagellum, 

 is shown. 



* 1 Boy. Soc. Proc.,' 1910, B, vol. 83, Plate 2. 



VOL. LXXXIV. — B. 



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