66 ILUNOIS BIOLOGICAL MONOGRAPHS [276 



STENOPHORA SILENE Leger and Duboscq 



[Figures 22 and 23] 



1904 Stenophora sUene Leger and Duboscq 1904:371-2 



Stenophora: Sporonts solitary, dimorphic, an elongate and a glo- 

 bular form. The elongate form 100/t in maximum length, width not 

 given. Ratio length protomerite : total length : : : 1 : 10 ; width proto- 

 merite : width deutomerite :: 1 : 1. Protomerite cylindrical, slightly 

 dilated top and bottom, nearly flattened at top, an apparent pore at apex. 

 Constriction at septum. Deutomerite cylindrical, gradually tapering 

 toward posterior end. Endocyte of protomerite with large achromatic 

 bodies, of deutomerite very finely granular and deeply staining. Nu- 

 cleus large, half the maximum width of deutomerite, ovoidal, its longi- 

 tudinal axis parallel to that of body, containing one large karyosome. 



The globose form, 55 to 60/t in maximum length. Width not given. 

 Ratio length protomerite : total length :: 1 : 6; width protomerite : 

 width deutomerite :: 1 : 2.3. Protomerite similar to that of elongate 

 form, but containing finely granular endoplasm as deeply staining as 

 that of deutomerite. Deutomerite broadly ovoidal, widest below center. 

 Nucleus less ellipsoidal than in elongate form. Cyst and sports not 

 known. 



Taken in Dauphine, France. Host: Lysiopetalum foeiidissimum 

 Savi. Habitat : Intestine. 



"Howard Crawley (1903) a signale dans Lysiopetalum lactarium des Etas- 

 Unis deux especes de Gregarines : Tune qu'il nomme Gregarina calverti dont la 

 forme generale et la taille sont si differentes de celles de la precedente que Ton 

 ne peut etablir de confusion; I'autre espece est rapportee au Stenophora iuli. II 

 est possible que celle-ci soit idcntique a notre Stenophora sUene, mais on ne peut 

 raflBrmer, car Crawley ne donne pas de dimensions de son Stenophora." 



Stenophora sUene is not the species described by Crawley (1903 :51; 

 1903a :634-5) as Stenophora juli. Crawley's species attains a length of 

 400ft, S. sUene of only lOO/i. The protomerite of S. j\di is broadly 

 conical, 1.4 times as wide as high; of 8. sUene cylindrical, flattened at 

 the apical end. Crawley's Gregarina calverti is still another species, 

 now called Amphoroides calverti. 



Whether or not there is an actual dimorphism in the Stenophoridae 

 is a problem still far from settled. The finding of elongate and globose 

 forms in the same species and the difference in staining reactions can, 

 I think, hardly be considered sexual dimorphism unless the two spo- 

 ronts are of somewhere nearly the same size. In 8. sHene, the difference 

 in length of the two is 100%. The difference in lengths of the elongate 



