OBSERVATIONS ON H@#MATOZOA IN CEYLON. 395 
the birth of the monozite sometimes show a slight crumpling, 
due to collapse; it clearly belongs to the category of plas- 
matic membranes. 
The provisional assumption of a direct genetic connection 
between the endoglobular hemogregarines of the first snake 
and the cytocysts of the second is not supported by observa- 
tion, but is based upon analogy, upon the specific identity of 
the hosts, and upon the proximity of the localities. If it is 
true, and if Simond’s analogous assumption in the case of 
Hemocystidium metschnikovi is also true, the life- 
history of the Hemogregarines must be highly varied and 
complicated, and cannot be interpreted until some of the 
many gaps are filled up. 
Another large Tropidonotus piscator was dug up, 
together with a clump of eggs, from a garden in Colombo, in 
February, 1905. Its blood was found to be in the same con- 
dition as in the previous specimen which was captured in 
July, 1904—that is to say, infested with cytocysts and free 
monozoites. No further information was obtained beyond a 
confirmation of results. The eggs contained young in an 
advanced stage of development, united to the yolk-sac by a 
narrow umbilical cord. The examination of the blood of these 
young incubants was negative in respect to Heematozoa. 
Since the publication of our preliminary note we have 
become acquainted with a paper by N. Berestneff (“Uber einen 
neuen Blutparasiten der indischen Frdésche,” ‘Archiv. f. 
Protistenkunde,’ vol. 11, 1903, pp. 343-348), in which a closely 
similar parasite was described from the blood of Indian frogs. 
The illustrations in the plate accompanying the paper were 
executed by the method of micro-photography, with the result 
that the points are not very clearly brought out. Micro- 
photography appears to have the advantage of absolute 
fidelity, counterbalanced by considerable obscurity. How- 
ever, the text makes amends for the shortcomings of the 
plate. 
Dr. Berestneff examined the blood of cold-blooded fresh- 
water vertebrates in the neighbourhood of a plague laboratory 
