166 ILLINOIS BIOLOGICAL MONOGRAPHS [376 



Cysts spherical, 250/x in diameter. Spores biconieal, truncate, 4 

 small spines at each pole, no equatorial spines. 13 by 6.5/i,. 



Taken at Poitou, France. Host: Gyrinus natator (L.) larva. 

 Habitat : Intestine. 



HYALOSPORA ROSCOVIANA Schneider 



[Figure 129] 



1875 Hyalospora roscoviana Schneider 1875:584 



Hyalospora: Sporonts biassociative, cylindrical, very elongate. 

 Length and width not given. Ratio length protomerite : total length 

 primite : : 1 : 9 ; width protomerite : width deutomerite : : 1 : 1.6. 

 Protomerite of primite cylindrical, conical, rounded at anterior extrem- 

 ity, twice as high as wide, a constriction at septum. Deutomerite elon- 

 gate cylindrical, tapering but slightly at posterior end and terminating 

 in a rounded extremity. Nucleus elongate ellipsoidal, with one large 

 karyosome. Epimerite not known. Endocyte yellow to yellow-orange. 



Cysts spherical (?), dehiscing by simple rupture. Spores broadly 

 ellipsoidal but sharply pointed. 



Taken at Roscoff, France. Host : Petrohius mariiimus. 



The name Petrobius has been applied to genera of both Orthoptera 

 (Thysanura) (1817) and Coleoptera (1836) and, not knowing which 

 one Schneider found as host, I have included this species among the 

 Coleopteran as well as among the Orthopteran parasites. Schneider 

 says of the habitat: 



"Les Petrobius se recontrent, en effet, sur le mur meme qui separe le labo- 

 ratoire de la mer, tapis dans les interstices des pierres. La meme espece est 

 commune sur une grande partie du littoral ". 



From its habitat, the host might be either an Orthopteran or a Coleop- 

 teran. 



This is the only species in the genus Hyalospora. 



SPHAEROCYSTIS SIMPLEX Leger 



[Figure 137] 



1892 Sphaerocystis simplex Leger 1892 :115-16 



Sphaerocystis : Sporonts solitary, subspherical, length 100 to 140ju.. 

 Width not given. Dicystid, having protomerite only when young. Shape 



