98 ILLINOIS BIOLOGICAL MONOGRAPHS [308 



1 : 5 to 1 : 6 ; width protomerite : width deutomerite : : 1 2. Protomerite 

 of primite hemispherical, slightly constricted at septum. Protomerite 

 of satellite flattened. Deutomerite ovoidal, widest below middle in pri- 

 mite, above middle in satellite. Posterior end rounded. Nucleus spheri- 

 cal with many small karyosomes, visible in vivo. Epimerite a simple 

 hyaline knob. 



Cysts spherical or slightly ovoidal, dehiscence by sixteen, more or 

 less, spore ducts; spores cylindrical, truncate at ends (not barrel shaped), 

 macrospores and microspores (15.8 by 7.9; 8.3 by 3.7/1,). 



Taken in France, and in Berlin and Danzig, Germany. Host : Por- 

 ficula auricularia L. Habitat : Intestine. 



Dufour designated as hosts Gryllus campestris and Forficula. He 

 gave a good figure of biassociative sporonts taken from Forficula, and a 

 figure of a single sporont from Gryllus which differs considerably in 

 shape from the other and probably represents another species, although 

 I have not attempted to place it systematically. 



Siebold accidentally found this species in Forficula but he did not 

 think the organisms were animals, for no motion was observed. 



Frantzius represented an accurate figure of the species. He named 

 Forficula as host, recognizing Dufour 's error in including a parasite 

 from Gryllus. 



Diesing indicated that Hammerschmidt had described a synony- 

 mous species, Clepsidrina conoidea, from the same host. He also included 

 as a synonym G. psocorum Sieh. but from the fact that the host, Psocus 

 quadripunctatus, is a Neuropteran, I doubt the authenticity of this state- 

 ment. Siebold 's paper is not available and the conjecture cannot be 

 verified. 



Schneider agreed with Diesing that Clepsidrina conoidea is a syno- 

 nym of Gregrina ovata. He discussed at length (1873) the cyst forma- 

 tion in this species. In 1885, he worked upon the species in greater de- 

 tail, finding and giving measurements of two kinds of spores. 



The species was the subject of a monograph by Paehler in 1904. 



I have examined about fifty specimens of Porficula auricularia L. 

 at Cold Spring Harbor, L. I., without finding parasites. 



