398 Philippine Journal of Science 1919 
life ingested by the snail which constitute a portion of the diet 
of the parasite. 
In this portion of the parasite the meganucleus and the micro- 
nucleus can be seen, floating and eddying about in most intimate 
association in the rapid and constant cyclosis of the endoplasm ; 
abundant food vacuoles; fragments of vegetable cells or smaller 
protozoa, partially digested; and, in some instances, contractile 
vacuoles. In stained preparations of lean individuals, where the 
alveolar structure does not obstruct the view, this area is 
traversed by an intricate system of numerous minute, canal-like 
structures (see fig. 1, 6), seen as clear homogenous-appearing 
lines running through the granular substance. Whether they 
represent true canals, lines of conduction of excretory products, 
or are merely artifacts due to unequal shrinkage of protoplasmic 
elements in the fixing fluid, remains to be determined. 
If the former, we should have a condition such as that obtain- 
ing in the gregarine-like infusorian Pycnothrix monocystoides. 
