2 5 J 
Todd. 6 The first of these is a very short form resembling the 
"tadpole” form. It measures between 8 and 14 /j in length (most 
commonly 11 to 12-5) by from O’g to 3-4 fx in breadth (average 1-5). In 
this type the trypanosome is widest slightly posterior to the nucleus, 
and then gradually tapers towards the anterior end. The posterior 
extremity presents all gradations in shape from acute to rounded ; 
most commonly, however, it is rounded. 1 he anterior extremity is 
effilated. The blepharoplast is small, round or oval, and is situated 
close to the posterior end and at one edge of the trypanosome. In 
most of the parasites the undulating membrane could not be seen ; in 
those in which it was visible, it was extremely narrow. 1 he thickened 
edge of the undulating membrane is poorly marked and in all cases 
ends abruptly with the anterior end of the trypanosome. A tree 
flagellum is absent. The nucleus lies in the middle third, and as a 
rule occupies the whole width of the body. It is oval, and either stains 
quite homogeneously or is composed of a varying number of darkly - 
staining chromatin granules (5 to 17) arranged in no definite manner. 
These granules were not joined by connecting threads as far as could 
be made out. In only a very few cases could a structure suggest ing a 
karyosome be seen. The cytoplasm stains a light blue and appears to 
be quite homogeneous. It was usually devoid of granules, but in some 
cases contained them. 
The second type is allied to the “stumpy" form. 6 It measures 
from 15 to 20/x in length (average 16/x) and from i'5 to 2'5/x in breadth 
(average 2 /i). It also lacks a free flagellum or, at most, has an 
exceedingly short one. In other respects it does not differ materially 
from the description given above. 
The third type resembles the “long" form. 6 It measures from 
20 1° 30jn in length (average 23 to 27/x) by from i’2 to 2/x in bieadth 
(average 1-5 tor 7/i ). The nucleus is rather elongated in the direction 
of the long axis of the body and as a rule stains quite intensely and 
homogeneously. This form has a fairly long free flagellum which 
measu res from 2-5 to 6' 5/ u in length. The posterior extremity is 
^her acute and the blepharoplast is situated farther away from it 
lhan in the other two types. In other respects it is comparable to the 
Uvo °ther varieties. 
