186 ILLINOIS BIOLOGICAL MONOGRAPHS [396 



This parasite is often practically transparent and can only be seen 

 after staining with iodine or a dye in water. The largest specimens con- 

 tain endocyte tinged with tan color in the deutomerite, while the proto- 

 merite is invariably colorless. The nucleus is spherical and small, one 

 third to one fourth the width of the deutomerite in its diameter ; it is in- 

 visible in vivo and contains one large transparent karyosome. 



Trophozoites were seen but the epimerite was not visible because of 

 the transparency when embedded. Cysts are unknown. 



Measurements of two associations are as follows ; all dimensions are 

 cited in microns : 



Total length association _ _ _ 185 208 



Primite : 



Length protomerite 20 21 



Length deutomerite _ 80 90 



Width protomerite _ 33 31 



Width deutomerite 61 60 



Total length sporont - _ 100 111 



Ratio 



length protom. : total length _ _ 1 :5 1:5 



width protom. : width deutomerite _ 1 :2 1 :2 



Satellite : 



Length protomerite _ 20 20 



Length deutomerite . :. -- 65 77 



Width protomerite ., 33 31 



Width deutomerite '.. 43 48 



Total length sporont 85 97 



Ratio 



length protom. : total length 1 :4.2 1 :4.8 



width protom. : width deutomerite _~1 :1.3 1 :1.5 



*Diameter nucleus _ 10 11 



This species differs from the other two species described from Coc- 

 cinellidae in size, shape of the protomerite of the satellite and in color. 



