74 SPOLIA ZEYLANICA. 
Another myriopod, Spirostreptus lunelii, Humb., from Avisawella 
(July), also proved negative. 
Some white ants, Calotermes militaris, from Peradeniya (August), 
were more interesting. They contained Trichonymphids, a Nycto- 
herus, and a spirochet, all apparently new. (See p. 89.) 
II.—DESCRIPTIONS OF SOME NEW FORMS. 
In this part of the paper some of the new, or hitherto undescribed, 
forms which are recorded in the preceding section are described in 
greater detail. 
The Parasites of Frogs and Toads. 
I have already noted the presence of a hemogregarine in the 
blood of Rana tigrina (p. 67). As I have already remarked, it seems 
to be identical with H. berestneffi of the Indian frog. There is only 
one other blood parasite which I have to describe. 
(1) Trypanosoma, sp., of Rana tigrina. 
This organism resembles the more slender forms of 7’. rotatorium 
of the European frog. When living the posterior end is bluntly 
pointed, and the animal usually has a ribbed appearance like that 
of T. rotatorium, but the ribs are only one or two in number 
(cf. fig. 12). There is a well-developed undulating membrane 
extending about halfway along the organism and ending in a free 
flagellum of moderate length (cf. fig. 12). The trophic nucleus 
is ovoid, and situated near the anterior end. The kinetic nucleus is 
a small deeply-staining granule about midway between the trophic 
nucleus and the extreme posterior end. 
Like 7’. rotatorium, this trypanosome is difficult to fix in blood 
smears. Most of the stained specimens which I obiaincd were 
badly distorted. Fig. 12 is drawn from one of the most favourable 
fixed and stained animals which I encountered, but it makes the 
animal appear a good deal stouter than it appears when alive. 
The average length of the trypanosome, so far as I have been able 
to determine from the few well-preserved specimens which I obtained 
in my preparations, is between 30 y and 40 uw, including the free 
flagellum. 
BALANTIDIUM. 
As already recorded; I found species of Balantidium inhabiting 
the duodenum and the large intestine of Rana tigrina. 
(2) Balantidium ovale, n. sp. 
This name I propose for the common species of Balantidium which 
occurs in the large intestine of R. tigrina. The animal is very like 
several other species already described. It differs from B. helene, 
Bezzenberger, only in size. Bezzenberger describes this species as 
