206 Proceedings of Indiana Academy of Science 



the examples already cited will suffice to show some, of the parasite 

 relationships that may be found. They indicate moreover, the economic 

 value of studies in this field. 



To the above list the writer would contribute a new form of para- 

 site relationship, namely, the occurrence of Distome larvae in other im- 

 mature parasites. The only analogous case of which we have any 





Fijr. 1. a, Anterior and postci'ior ends of larval cestodc, showing Distome larva 

 parasite in anterior portion, x 12 ; b, immature CUnostomum marginatum parasitized by 

 three larval Distomes, x 12; c, Agamodistomiim tnarcianae (?), the larval Distome in- 

 festinK the above parasites, x 25. The small fifnircs indicate one-half natural size. 



record is one reported by Cort* in which a Trematode was parasitized by 

 Gordius lai*vae. In the accompanying figure are shown two parasitic 

 forms in which secondary infestation was found. The first (fig. la) 

 is an immature Cestode, one of seven specimens taken from the same 

 liver. These were free-living rather than encysted forms and were 

 woven in and out throughout the parenchyma of the liver. They were 



' Cort, W. W. Gordius Larvae Parasitic In a Trematode. Jour. Parasit., 1:198-199. 



