694. MURIEL ROBERTSON. 
EXPLANATION OF PLATES 16 anp 17. 
All figures were drawn with the Abbé camera under a 2 mm. Zeiss 
apochromatic immersion objective. A Wo. 12 compensating ocular and 
tube length of 250 mm., giving a magnification of approximately 3600 
diameters. This has been reduced by the lithographer to approximately 
2400 diameters. 
Figs. 1-7.—Trypanosoma vittatx from the blood of Emyda 
vittata. 
Fig. 1—Trypanosome from blood of tortoise stained with Heiden- 
hain’s iron hematoxylin after fixation with corrosive and acetic, wet 
method throughout. 
Fig. 2.—As above, showing a characteristic attitude. 
Fig. 3—Dried Giemsa film of Trypanosome showing protoplasmic 
halo and red ring round karyosome. 
Fig. 4.—Trypanosome as above, showing myonemata and line along 
undulating membrane. 
Figs. 5 and 6.—Small specimens from blood of tortoise. 
Fig. 7.—Dividing stage from blood of tortoise. 
Figs. 8-12a4.—Early stages in crop of leech. These are from the 
water leech, Limnatis granulosa. 
Fig. 8.—Division stage ; the four new flagella are already developed ; 
kinetonuclei are dividing by longitudinal splitting. 
Fig. 9.— Division stage showing nuclear spindle. 
Fig. 10.—Second division occurring before the completion of the first 
as regards the protoplasm. Both kinetonuclei in act of division, only 
two flagella so far developed. 
Fig. 11.—Rounded flagellate—the product of the divisions of the 
rounded off Trypanosome, 
Fig. 12—Karly flagellate stage ; note the lengthening of the body. 
Fig. 124.—Another early flagellate stage. 
