208 



THE HAEMOELAGELLATES 



under different conditions of life. The well-known Trypanosoma 

 rotatorium of frogs (Fig. 8, A and B) is, taking it all in all, one of the 

 largest forms so far described. Its length 1 varies from 40 to 60 //, 

 while its greatest width dorso-ventrally - is from 8 to 30 ^ ; in the 



/*.- 



H. 



FIG. 7. 



Representative Mammalian, Avian, and Reptilian Trypanosomes. A, Trypanosoma lewisi, 

 after Bradf. and Plim. ; B, T. brucii, after Lav. and Mesn., x 2000 ; C, T. gambiense (blood, T.- 

 fever), after Bruce and Nabarro ; D, T. equinum, after L. and M., x 2000; B, Trt/panomorpha 

 (Trypanosoma) noctuae, after Schaud. ; F, Trypanosoma avium, after L. and M. ; G, T. hannae, 

 after Hanna; H, T. (Spirochaeta) ziemanni, after Schaud. ; J, T. damoniae, after L. and M., 

 x 2000. c.g, chromatoid grains ; v, vacuole ; l.s, longitudinal striation. 



very wide individuals breadth is gained more or less at the expense 

 of length. Conversely, the human parasite, T. gambiense (Fig. 7, c), 

 is one of the smallest forms, its average size being about 21 

 to 23 ju, by 1 1 to 2 p.. The majority of Mammalian Trypanosomes 



1 The length is always inclusive of the flagellum, unless otherwise stated. 



2 Adopting Leger's convention, by which the convex side, bearing the undulating 

 membrane, is distinguished as dorsal ; the measurements of width always include the 

 undulating membrane. 



