356 TRYPANOSOMA 
General morphology of trypanosoma. Trypanosomata of all species 
are in general very similar. The morphology is said to vary greatly 
in the same species and to a greater extent in different species. In 
general the trypanosoma may be said to measure from 1 to 5 in 
thickness and from 15 to 45v. in length, including flagellum. They all 
show very active eel-like movements and some motility. The nature 
and extent of the motility varies. The fact as stated, that variations 
are occasionally found in one species, often, indeed, in a single prepara- 
tion, which are nearly as great as those observed 
between different species, renders the specific de- 
termination difficult. The flagellum at the anterior 
end of the parasite varies greatly in length. Itis 
actively motile, pointed and continuous with the 
; thickened margin of the undu- 
lating membrane ending at or 
near the centrosome. The undu- 
lating membrane extends along 
the border of the organism from 
near the centrosome in the pos- 
terior portion to the anterior end 
of the organism, from whence it 
continues as the free flagellum. 
cee gels Its breadth and folds vary con- 
OPLASMABORRELLI: siderably. 
Fic. 84. TRYPAN- — ¢, CENTROSOME; fa, : : 
OSOMA BRUCEI: ¢, 4awrprton Flags, He nucleus is usually situated 
CENTROSOME; f, uM; fp,posteRIoR in the anterior half of the parasite 
FLAGELLUM; ™,UN- FLAGELLUM; ™, UN- s = | 
DULATING MEM- pvuratine. mem. 20d varies bothin size and shape. 
BRANE; ”, NUC- sranE; 7m, nuc- It is generally oval or round, and 
2,000. Ore te. 1,800. (iter be assumes other contours with the 
veran and Mesnil). veran and Mesnil), different stages of division. The 
centrosome as a rule is in the posterior and more blunt end, and it 
appears to have an intimate association with the flagellum and un- 
dulating membrane. Its location has been used as a diagnostic 
point in determining species. , 
The protoplasm is homogeneous or granular, depending upon the 
age of the parasite, its environment and, perhaps to a certain degree, 
upon the species. Few or many fine or coarser granules may be 
found scattered throughout the protoplasm. 
Multiplication. Voges gives three forms of multiplication, namely, 
longitudinal, transverse fission, and segmentation. He did not 
