302 
Only two examples of the large trypanosome (total length about 
64//.), were obtained. Unfortunately, both are so obscured by 
surrounding red cells that it is impossible to reproduce them. Their 
blepharoplast is placed much nearer to the nucleus than to the 
posterior extremity (and in one instance in a vacuole). The nucleus 
almost extends across the body. The undulating membrane is ample 
and the flagellum seems to be comparatively short. The body of the 
parasite is striated longitudinally ; at the level of the nucleus only 
seven striations could be counted. In one parasite an appearance 
resembling a longitudinal striation was present in the undulating 
membrane. The dimensions of this type are: posterior extremity to 
centre of blepharoplast. 28-3/4 (in one parasite only 17/x); centre of 
blepharoplast to posterior border of nucleus, 3-3/4; anterior border of 
nucleus to termination of body, i 8 ' 3 / 4 ; free flagellum, 8-3/4; width 5% 
At Coquilhatville lack of time prevented a careful examination of 
the parasite in fresh preparations. Some months later another 
hornbill was shot, and its blood was found to contain trypanosomes 
resembling the small type described above. Fresh coverslip prepara¬ 
tions of blood were kept at room temperature (28° C.) and watched 
for some hours by Dr. Inge Heiberg. The changes in form indicated 
in the following diagram were observed to occur in three hours. 
still seen. Occasionally pairs occurred joined by their flagella. 
After three hours both normal and very short “stumpy” parasites 
were seen, while after four hours, longitudinally dividing, spherical and 
irregular, certainly degenerating, parasites were present. 
Eighteen hours after the preparation was made dividing form', 
similar to those seen at the fourth hour were still present, while a 
stouter trypanosome than those seen at the commencement of d- e 
observation now appeared for the first time. 
