134 ILLINOIS BIOLOGICAL MONOGRAPHS [344 



rounded. Nuclei spherical, one large karyosome in each. Endoplasm 

 not dense. 



Cyst and spores unknown. 



Taken in the Province of Izu, Japan. Host: Tribolium ferrugi- 

 neum F. Habitat: Intestine. 



Under the name Gregarina minuta, Ishii described and illustrated 

 two species of gregarines, one proving to be the above member of the 

 family Didymophyidae, the other a true Gregarina. The two forms 

 were shown to be different by the absence of a protomerite in the satel- 

 lite in the former and its presence in the latter. There was also a differ- 

 ence in the size of the two kinds of associations. The smaller were those 

 of a true Gregarina, having a protomerite in the satellite, and the name 

 used by the author, Gregarina minuta, applies to them only. The larger 

 associations are those of the other form, and I have called this species 

 Didymophyes minuta (Ishii). For a more detailed argument concern- 

 ing these species, see appendix at the end of this chapter. 



1826 

 1828 

 1837 

 1848 

 1848 

 1848 

 1851 

 1851 

 1863 

 1863 

 1892 

 1899 

 1913 



Actinocephalus : Sporonts solitary, length 300 to 400/x. "Width not 

 given. Eatio length protomerite : total length : : 1 : 5 (without epime- 

 rite) ; width protomerite : width deutomerite : : 1 : 3. Protomerite 

 nearly globular, carrying at the apex a persisting epimerite, situated 

 upon a thick prominent neck. Epimerite larger than protomerite, con- 

 sisting of hemispherical plateau around the periphery of which is sit- 

 uated a corona of 12 or more large upwardly directed digitiform pro- 

 cesses. Deep constriction at septum. Deutomerite widest above middle, 



