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. 



ACTINOCEPHALUS CONICUS (Dufour) Frantzius 



[Figures 75, 76, 101, 102, 103] 



1826 sp. 



1828 - - Canica 



1837 Gregarina conica 



1848 Actinocephalus Lucani 



1848 Actinocephalus Lucanus 



1848 Actinocephalus conicus 



1851 Gregarina Lucani 



1851 Gregarina conica 



1863 Gregarina Lucani 



1863 Gregarina conica 



1892 Stephanophora radiosa 



1899 Stephanophora lu,cani 



1913 Actinocephalus lu,cani 



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

 given. Ratio 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, 



