355 
Nucleus close to it. Undulating membrane much 
folded. Flagellum, io/a. 
lb. 7 . costatum , Var. II :—Striations, but not 
always well defined, 37 by 14/A. Blepharoplast, io/a 
from posterior end. Nucleus close to it. Undulating 
membrane much folded. Flagellum, 24/A. 
l c. 7 . rotatorium ( s. strict). —Non-striated, but 
very full of staining granules. 38/A by i8/a. Blepharo¬ 
plast about 3 /a from posterior end. Nucleus very long, 
17/A by 2 /a, 13/A from the anterior extremity. Undu¬ 
lating membrane much folded. Flagellum, 22-30/A. 
During division it becomes round, losing its membrane 
and flagellum. 
l d. 7 . inofinatum.—Vide below. 
le. 7 . undulans. — 32 by 7*5/a. Blepharoplast 
1 o/a from posterior end. Nucleus about the middle. 
Usually no free flagellum. 
l f. 7 . gracile (S and C).—syn. 7 . elegans (F and 
A). 36 by 3/A. Longer and thinner than previous 
one. Free flagellum very short, about 3/t. 
2. 7 . mega. —In a Gambian frog. 72/A by 8 /a, 
not including the flagellum 10-15/A. 
3. 7 . karyozeukton. —In a Gambian frog. 57 
by 3" 5 /a* Flagellum 15/A. A chain of granules joins 
the two nuclei. 
4. 7 . rotatorium , var, nana.— In /h esculenta , 
Algeria. Average length, 22 aa. 
5. 7 . inopinatum. —In R. esculenta in Algeria, 
2 5~3 °/a, including flagellum. Is pathogenic to frogs, 
producing oedema, hydro-pericardium, ascites, hae¬ 
morrhages. Trypanosomes are abundant in the blood. 
It has been thought that the trypanosome is a flagellate 
stage of one of the haemogregarines of the frog. 
Leeches ( Helobdella algira) transmit the disease for as 
late as a month after their infection. 
