392 



TRYPANOSOMA 



§ 305. General morphology of trypanosoma. Try- 

 panosoma of all species are in general very similar. The mor- 

 phology is said to vary greatly in the same species and to a 

 greater extent in dififerent species. In general the trypanosoma 

 may be said to measure from i to 5 yu in thickness and from 15 

 to 45 jx in length, including flagellum. They all show very 



active eel-like movements 

 and some motility. The 

 nature and extent of the 

 motility varies. The fact 

 as stated, that variations 

 are occasionally found in 

 one species, often, indeed, 

 in a single preparation, 

 which are nearly as great as 

 those observed between dif- 

 ferent species, renders the 

 specific determination diffi- 

 cult. The flagellum at the 

 anterior end of the parasite 

 varies greatly in length. It 

 is actively motile, pointed 

 and continuous, with the 

 thickened margin of the 

 undulating membrane end- 

 ing at or near the centro- 

 some. The undulating 

 membrane extends along 

 the border of the organism 

 from near the centrosome in the posterior portion to the anterior 

 end of the organism, from whence it continues as the free 

 flagellum. Its breadth and folds vary considerably. 



The nucleus is usually situated in the anterior half of the 

 parasite and varies both in size and shape. It is generally 

 oval or round, and assumes other contours with the different 

 stages of division. The centrosome as a rule is in the posterior 

 and more blunt end, and it appears to have an intimate assoei- 



F1G.103. Trypan- 

 osoma Brucei : c, 

 centrosome ; f, 

 flagelluin ; in,un- 

 dulating mem- 

 brane; n, nucleus. 

 X about 2,000. 

 (After Laveran 

 and Mesnil). 



Fig. 104. Trypan- 

 oplasmaBorrelti: 

 c,cenirosome ; fa, 

 anterior flagel- 

 lum : fp , posterior 

 flagellwm; m, un- 

 dulating mem.- 

 brane; n, nucleus; 

 X about i,Soo. 

 (After Laveran 

 and Mesnil). 



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