6 University of Michigan 



The pharynx is small, almost globular, and in contact with 

 the oral sucker. It measures about 0.021 mm. in diameter. 

 No oesophagus is present- Immediately behind the pharynx 

 is the bifurcation of the intestine. The coeca are simple wide 

 tubes which extend to a point about midway between the 

 acetabulum and the posterior end of the body. Their non- 

 granular contents stain readily with eosin, erythrosin, orange 

 G. and very slightly green with thionin. The excretory sys- 

 tem is simple. An excretory pore is terminally situated and 

 leading into this is a short vesicle with two short branches 

 which extend forward. It was impossible to find any such 

 branches as Nicoll (1912) has shown in Ccrcaria ordiiiaia and 

 it is doubtful if they exist in this species. 



In the region just anterior to the excretory vesicle may be 

 seen a small group of large cells and granules the significance 

 of which is not understood. They may be the anlagen of 

 sexual organs. 



Measurements of Ccrcaria inarcianac in millimeters. 



A study of the distribution of these cercariae in the tissues 

 of the host shows that they occur chiefly (i) in the mesenteric 

 and peritoneal tissues, fat bodies, and in the sub-peritoneal 

 lymph spaces, (2) in the large lymph .spaces beneath the skin 

 of the tail, a:nd immediately beneath many of the scutes of the 



