24 
Blood Parasites 
a I'ound or oval nucleus. Sometimes a structure resembling a centrosome 
was also seen. 
The vermicules or merozoites measured about 0 75 p, by 1'25 /u,. 
In a few specimens a fine line could be detected reaching from the 
nucleus to the centrosome. 
In addition to the enclosed vermicules a number of similar bodies 
were seen free, but besides these two forms there were bodies irregularly 
placed in a bluish matrix, having many of the characteristics of 
Leishmania. Smears made from the liver, spleen, and bone marrow 
were negative, and no trypanosomes could be found in the peripheral or 
heart blood. 
Carini regarded them as forms of schizogony of T. leiuisi and stated 
that they were derived from trypanosomes which bad become encysted. 
Delanoe (1912) found these cysts, which average 5 jx in diameter, 
containing eight vermicules, more frequently in old than in young rats. 
He says that of 22 adult rats, cysts of Carini were found in all, but none 
were infected with trypanosomes. 
He concludes that they represent a new parasite of rats, which has 
nothing to do with T. leiuisi and terms them Pneumocysts of Carini, and 
regards them as belonging to the Coccidia. 
Trypanosoma cuniculi. 
I have not had many opportunities of examining the blood of rabbits 
except those which have been dead some time, but occasionally I have 
met with T. cuniculi, always in small numbers, sometimes associated 
with Coccidia. The trypanosome closely resembles T. leiuisi but differs 
from the latter in that it is generally smaller, the posterior extremity is 
somewhat shorter and thinner, the body shorter, whilst the flagellum is 
longer. 
The following figures give the average measurements of T. cuniculi: 
Total length 
27 At 
Posterior end to 
middle of 
Length of body 
17 
nucleus... 
. 11m 
Length of flagellum ... 
10 
Width of body 
... ltol-5 
Posterior end to middle 
of 
Length of nucleus 
2 
centrosome 
... 2-5 to 3 
Width of nucleus 
1 
Trypanosome of Cow. 
In the blood of a cow suffering from Red water Fever I found a huge 
trypanosome, and in the same film another degenerated or distorted 
example. The parasite was in the form of an almost perfect S, being 
