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 : Triholium 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. Dufour 1826:43 



1828 - - Conica Dufour 1828 :367 



1837 Gregarina conica Dufour 1837 :12 



1848 Actinocephalus Lucani Stein 1848 :223 



1848 Actinocephalus Lucanus Frantzius 1848 :195 



1848 Actinocephalus conicus Frantzius 1848:195 



1851 Gregarina Lucani Diesing 1851 :14 



1851 Gregarina conica Diesing 1851:8 



1863 Gregarina Lucani Lankester 1863 :95 



1863 Gregarina conica Lankester 1863 :95 



1892 Stephanophora radiosa Leger 1892 :127 



1899 Stephanophora lucani Labbe 1899 :23 



1913 Actinocephalus lucani Ellis 1913b :277 



Actinocephalus : Sporonts solitary, length 300 to 400/x. 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, 



