OBSERVATIONS ON HAMATOZOA IN CEYLON. 397 
After afew minutes, while under observation, the movements 
cease, the parasite becomes hyaline, and finally dissolves in 
the plasma. 
He observed simultaneous infection of a corpuscle by the 
new parasiteand by a Drepanidium. In his modification 
of the Romanowsky method the nucleus of the parasite 
stained intensely reddish violet, the protoplasm blue, the 
capsule reddish-violet. 
While encapsuled inside the corpuscle the acuminate pos- 
terior end of the parasite lies in the widened end of the capsule. 
Dr. Berestneff says that the parasite which he discovered 
in the Bombay frogs belongs by its structure, form, and 
movements, to the Hzmogregarinide, and shows close 
affinity to Danilewskya krusei, Labbé (Drepanidium 
magnum= Hemogregarina magna, Grassi and Feletti). 
Attempts to transmit the parasite from infected to non- 
infected frogs by injection into the dorsal lymph sinus gave 
no result. 
From the above description, which we have thought well to 
quote at some length, it seems certain that Dr. Berestneff’s 
parasite differs at least specifically from that described by us, 
as shown, to mention only two points, by the relation of the 
monozoite to its capsule, and by the position of the nucleus. 
For facility of future reference we propose to name Berest- 
neff’s parasite Hemogregarina berestneffi. It will 
probably not enjoy this name long, since the genus Hemo- 
eregarina will most likely be found to have as little stability 
as Halteridium. 
V. TRYPANOSOMA AND HALTERIDIUM. 
In the light of the discoveries which Schaudinn has 
recorded these two parasitic forms should be considered 
together, although we have not yet found them associated 
in the same host. 
Trypanosoma lewisi (Sav. Kent) is extremely common 
in the house rats (Mus decumanus) of Colombo. Some- 
