PARASITIC PROTOZOA FROM CEYLON. 79 
my stained preparations were lost before they had been carefully 
examined. 
No ticks were found on the snake, but one is tempted to suggest 
that these animals, which are common on many snakes, are the 
carriers of the spirochet. . 
The living spirochets (fig. 15) appeared as slender, flexible, 
corkscrew-like organisms, actively motile, and closely resembling 
S. duttoni in general form. In length they measure ca. 15 vu, and 
their breadth is probably about 0°5 u., though I have not been able 
to obtain sufficiently accurate measurements of the latter. 
In the films stained by Giemsa’s method the organisms were 
coloured a uniform pink. 
In a single instance (fig. 16) I observed an organism which 
appeared to be on the point of dividing into two. But whether 
division had been longitudinal or transverse it was impossible to 
decide. The thickness of the organism certainly suggests the latter 
mode of division. 
The Hemogregarine from Crocodilus porosus. 
Hemogregarines have already been described from crocodiles 
in various parts of the world. Simond (190la) appears to have 
been the first to record hemogregarines from Crocodilia. He 
described (1901, 1901a) a form, under the name A. hankini, from 
the Indian gavial; and he further noted (1901, p. 320) that the 
same organism occurred in Crocodilus porosus (?), and stated that 
Marchoux had found a similar parasite in a Senegal crocodile. 
Borner (1901) almost simultaneously described a hemogregarine 
from Crocodilus frontatus and Alligator mississippiensis, and gave it 
the name H. crocodilinorum. If these prove to be the same species, 
then the priority of name rests with H. hankini; for, as Simond 
points out, his account was published a month before that of Borner. 
It is probable, therefore, that the Ceylon form from C. porosus is 
Hemogregarina hankini, Simond. 
Minchin, Gray, and Tulloch (1906) figure a hemogregarine from 
a Central African crocodile, and this organism is repeatedly men- 
tioned in subsequent reports of various'sleeping sickness commissions. 
The form which I found in the Ceylon crocodile bears a close 
resemblance to many of the figures of Simond and Borner. 
All the individuals which I examined were in red blood corpuscles 
from the circulating blood. ‘They all presented the appearance 
shown in figs. 9, 10; that is to say, they were all large, doubled-up 
individuals. Sometimes the two halves were approximately equal 
in thickness (fig. 9), but sometimes one was considerably thicker 
than the other (fig. 10). In preparations stained by Giemsa’s 
method the nucleus always appeared as a compact mass of deep 
purple granules (figs. 9, 10). In length the animals (doubled up) 
measured from 12 u to 15 uy. 
