xv, 4 De Leon: Balantidium Haughwouti 407 
Another subject for future investigation lies in the determina- 
tion of the ability of Balantidium haughwouti to live in a host 
other than Ampullaria. This is important by reason of the fact 
that the host is frequently eaten by persons living in the Phil- 
ippine Islands. As has been stated, it shows no tendency to 
penetrate the tissues of the host within which it has been studied, 
but that is no criterion of what it might do in another host. 
At the same time it would seem that the danger of infection in 
man by this parasite is rather remote, if for no other reason 
than that the character of the food it receives in the gut of 
the Ampullaria is such as would involve a rather revolutionary 
readjustment of the parasite’s metabolism on adaptation to a 
life in the tissues of man. 
In conclusion, I desire to designate this species Balantidium 
haughwouti in compliment to the man who first observed it. 
CONCLUSIONS 
The characters possessed by this organism indicate its inclu- 
sion in the genus Balantidium. 
Further work is needed to determine definitely the functions 
of the cytopyge and of the excretory systems. 
It is also in order to determine if there is any neuromotor 
apparatus. 
A close relation is shown between the meganucleus and the 
micronucleus. For the present it is assumed that this has to 
do with division. 
Stained preparations of Balantidium haughwouti together 
with shells of the snail Ampullaria from which they were taken 
have been deposited in the protozoological collection at the Bu- 
reau of Science, Manila, and at the Smithsonian Institution in 
Washington D. C. 
ACKNOWLEDGMENTS 
To Prof. Frank G. Haughwout, chief of the department of 
parasitology, at whose instance this study was undertaken, I 
wish particularly to express my appreciation of the stimulating 
and material help and encouragement given me throughout the 
course of the work. I wish to thank Prof. Sol F. Light, who 
identified the snail host ; Dr. Lamberto Leiva for material help ; 
and Prof. Ricardo Fernandez for assistance in translating from 
the French literature. For permission to undertake this work 
in another department while a member of the staff of the de- 
