252 University of California Publications in Zoology [Vol.20 



The longitudinal axis and the longest transverse axis of each indi- 

 vidual were measured, and the ratio of length to breadth computed 

 (see Table I). 



TABLE I 



Comparative Measurements of One Hundred Individuals Each or 



Balantidium coli and Balantidium suis 



Individuals trom Pig No. 4 

 (,Bal. coli, with one exception) 



* other characters showed that these individuals were of tlie other species rep- 

 resented in the table. 



