1911.] Morphology of Trypanosoma gambiense (Dutton). 329 



The average length of Trypanosoma gambiense in man and the other species 

 .of animals, taken from Table I, is as follows : — 



Species of animal. 



In microns. 



Average length. 



Maximum length. 



Minimum length. 





24 -3 



33 -0 



15-0 





23 -4 



33-0 



18 -0 





22 -4 



31 -0 



15 -0 



Ox 



19 5 



29 -0 



15 -0 





22 -4 



30 -0 



15 -0 



Bushbuck 



20 -7 



27 -0 



16 -0 



Eat 



22 -4 



32 -0 



13 -0 



.Chart I. — Chart giving Curve representing the Distribution, by Percentages, in respect 

 to Length of 1000 Individuals of Trypanosoma gambiense. 





is / 



4 /5 / 



6 /7 / 



6/3 2 



Zt 2 



c ro 



2 25 2 



•73 . 

 4 25 2 



6 27 2 



3 23 o 



31 £ 



* 35 JWI 



/2 









f 



\ 















3 

























¥ 







- 1 



















? 6 

 S 5 







t 



















S 







h 



















a 



-5sL 























Breadth. — The long and slender forms average 1*5 microns, the short and 

 stumpy 2 - 5 microns. 



Shape. — This, as stated above, is a markedly dimorphic species. 



Contents of Cell. — The protoplasm often shows many chromatin granules in 

 its substance. 



Nucleus. — Kesembles Trypanosoma brucei, in that the nucleus is oval in the 

 long and slender, and round in the short and stumpy forms. 



Micronucleus. — Small and round, and situated, on an average, 1*1 microns 

 from the posterior extremity in the short and stumpy, 1*3 in the intermediate, 

 and 1*8 in the long and slender forms. 



Unclulati7ig Membrane. — This, as in Trypanosoma brucei, is well developed, 

 and thrown into many bold folds and undulations. 



Flagellum. — The flagellum in the long and slender and intermediate forms 

 is free. There is no free flagellum in the short and stumpy forms. 



2 b 2 



