322 Haemogregarines 
over, in most cases it is necessary to compare my findings with drawings alone, 
as the descriptions are always too short. 
One of the forms that most closely resembles ours is H. nucleobisecans 
from Bufo melanostictus (Shortt, 1917). This form differs from ours in the 
presence of small forms, and in its free forms being much larger and of a 
different shape. H. nucleobisecans seems to affect the host nucleus in the same 
way as ours, splitting it into two in some cases. According to Shortt “this 
is brought about by the pressure of the concave border of the capsule of the 
parasite upon the adjacent border of the host-cell nucleus.” In this case the 
fragmentation of the nucleus seems to be purely mechanical, differing in that 
respect from the fragmentation of the host nucleus seen in the genus Karyo- 
lysus. 
If this be the case in our parasite, it is difficult to decide to which genus 
it should be referred in the absence of any sexual stages. 
For the sake of registration, I propose to refer the parasite, provisionally, 
to the genus Haemogregarina and name it Haemogregarina moloensis nov. spec. 
Host: labelled Bufo No. 8 , from Molo, July 3, 1914. 
The blood corpuscles of this animal were strongly infected with haemo¬ 
gregarines. The host cell does not seem to undergo any special alterations; 
the enlargement observed is to be ascribed to mechanical causes, being due 
to the expansion of the growing parasite. In some cases, however, the nucleus 
of the erythrocyte is seen to be broken up into two parts. 
The haemogregarines occurring in the blood of this host are represented 
by several forms. 
1. The predominant form of the parasite is a large haemogregarine of 
irregular oval or bean shape, in most cases not bent on itself (Figs. 24, 25), 
but sometimes with a distinct second limb (Fig. 22), or traces of the fusion 
of both limbs (Fig. 23). The average measurements of these forms are 17-5/x 
by UfjL. Their internal structure will be described below. 
2. Besides these forms, in much fewer numbers, are encountered com¬ 
paratively small parasites of pretty regular spindle or oval shape (Fig. 19), 
measuring lig by 4*7/x. 
3. There are also encountered somewhat larger parasites in which one end 
is dilated, and the other gradually attenuates in the form of a pointed tail 
(Fig. 20). This extremity is usually turned to the side, but not bent over. 
4. And lastly there occurs another form, in general resembling the one 
just described, but more massive and with the tail bent over the body (Fig. 21). 
The protoplasm of the last three forms appears to be finely granulated. 
In the first of them (Fig. 19) vacuoles are visible at both poles (possibly 
artifacts). The nucleus is usually disposed nearer to one of the extremities 
of the body. In the second form (Fig. 20) the nuclear chromatin is arranged 
in rather compact lumps, whilst in the third form (Fig. 21) the nucleus 
occupies a larger space and its chromatin is arranged more loosely. 
