UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 20, No. 10, pp. 243-300, pis. 27-28, 15 figures in text May 8, 1922 



ON BALANTIDIUM COLI (MALMSTEN) AND 



BALANTIDIUM SUIS (SP. NOV.), WITH 



AN ACCOUNT OF THEIR NEURO- 



MOTOR APPARATUS 



BY 



j. DALEY MCDONALD 



UNIVERSITY OF CALIFORNIA PRESS 



BERKELEY, CALIFORNIA 



1922 



