120 ILLINOIS BIOLOGICAL MONOGRAPHS [330 



It is this character which led him to place the gregarine in the genus 

 Stenophora. He adds: 



"The suggestion is permissible that this form is actually the common Steno- 

 phora jitlipusilli Leidy, somewhat altered from being in the wrong host ". 



The suggestion that the species belongs to the family Stenophoridae is 

 excluded when one considers the method of cyst dehiscence, which is that 

 characteristic of the family Gregarinidae rather than that of the Steno- 

 phoridae. 



The sarcocyte at the anterior end of the protomerite is often thick- 

 ened and papillate but I have not seen a trace of a pore. 



A table of measurements follows, all dimensions being given in 

 microns : 



Length sporont 500 490 470 420 370 290 



Length protomerite 80 70 80 60 60 50 



Width protomerite 110 90 80 80 80 50 



Width epimerite 30 



Width deutomerite 150 150 160 140 130 60 



Eatio 



length protom. : tl. length 1 :6.3 1 :7 1 :6 1 :7 1 :6.1 1 :6 



width protom. : width deu. 1 :1.3 1:1.7 1:2 1:1.7 1:1.6 1:1.2 



LEIDYANA GRYLLORUM (Cuenot) Watson 

 [Figure 209] 



1897 Clepsidrina gryllorum Cuenot 1897 :52-54 



1900 Gregarina macrocephala Labbe 1899 :10 



1901 Gregarina gryllorum Cuenot 1901 :594-5 

 1916 Lcidyana gryllorum Watson (This paper) 



Leidyana : Sporonts solitary, never associative, cylindrical. 

 Length 420/^. Ratio length protomerite : total length : : 1 : 5 ; width 

 protomerite : width deutomerite : : 1 : 1.1. Protomerite subspherical, a 

 deep constriction at septum. Deutomerite cylindrical, conical at end. 

 Epimerite globular, nucleus small, spherical. Cysts spherical or ovoi- 

 dal, 190 to 240jti in diameter. Spore ducts 3 to 8^. Spores barrel shaped, 

 7ju, in longest axis. 



Taken in Ardennes and Meurthe-et-Moselle, France. Host: Gryl- 

 lus domesticus (L.). Habitat: Intestine. 



Labbe placed this species which had been mentioned but not de- 

 scribed by Cuenot as a synonym of Gregarina macrocephala Schn., 



