THE RHODESIAN TRYPANOSOME 37 



but presenting somewhat different symptoms from 

 the ordinary type, in that the ultimate sleeping stage 

 was not well marked. Detailed examination by 

 Drs. Stephens and Fantham of the trypanosomes 

 present in the blood revealed the fact that the fatal 



FIG. 7 TRYPANOSOMA RHODESIENSE 



A-C, Forms showing nucleus approaching the posterior end ; D, 

 trypanosome with posterior nucleus ; E, F, long and short forms 

 with pointed aflagellar ends (" snout " forms) 



organism had a different structure from the form so 

 well known in West Africa and the Congo. The 

 parasites at times had a peculiarly elongated pos- 

 terior extremity that resembled a long snout, and the 

 " snout " forms (Fig. 7, E, F) were almost enough to 



