337 
developed, and wound in numerous folds around the body; it was 
r^fi wide. In trypanosomes from the fish of December gth, the 
undulating membrane was poorly developed, had a few folds and 
was not more than i/x in width. The nucleus was round to oval, its 
long diameter was at right angles to that of the body, and it 
occupied the whole width of the parasites. It was granular in 
structure and contained a fibrous network on which were seen 
sixteen to twenty-four chromatin granules and one or two darker 
granules- the karyosomes. T he body was more darkly stained in 
the fish of December 30th. Superficial longitudinal striations to the 
number of seven were counted near the nucleus. Divisional forms 
were few in this type and followed the usual method of longitudinal 
division. 
The long type was characterised by its size, its tapering 
extremities, its comparatively short flagellum and by the possession 
of from one to four vacuoles just anterior to the blepharoplast. The 
blepharoplast was large, oval or round, and situated 2/x from the 
posterior extremity ; its measurements were the same as those of the 
medium type. The nucleus had the same characteristics as that of 
the middle type, except that it did not quite occupy the width of the 
body. The protoplasm was the same as in the medium type, except 
for the above mentioned vacuoles, which were always present. Eight 
superficial longitudinal striations were present and these were seen to 
cross the nucleus. No divisional forms of this type were seen. 
The measurements of the three types were as follows: 
Small form 
Medium form 
Long form 
Measurement I 
... O’O /A 
... o - o to 1*5 /X 
... 2'0 
/* 
II 
... 127 IX. 
I 4 ’ 2 /* 
... 25-0 
/* 
„ HI 
... 3'° 
37 /* 
... 45-0 
/* 
IV 
... 67 /z 
12 ’O [J. 
... 19-5 
/* 
„ V 
... 12*0 fX. 
I 3'5 M 
... 10-5 
/* 
VI 
I'O /X 
3 *o/* 
••• 4'5 
/* 
Total length ... 
■ 34'5 /* 
45 '° /* 
... 6 i ‘5 
/* 
Although the trypanosome described by Montel 1 closely resembles 
our large form, we have seen no account in the literature of any 
parasite morphologically identical with those described above. 
