60 ILLINOIS BIOLOGICAL MONOGRAPHS [60 



Family GREGARINIDAE Labbe 1899: 9 

 Genus GREGARINA Dufour 1828: 366 

 GREGARINA CLAVATA Kolliker 

 [Figures 22 and 89] 



1848 Gregarina clavata Kolliker 1848: 10 



1848 Gregarina clavata Frantzius 1848: 194 



1848 Sporadina clavata Frantzius 1848: 195 



1851 Gregarina clavata Diesing 1851: 14 



1859 Gregarina clavata Diesing 1859: 734 



1863 Gregarina clavata Lankester 1863: 94 



1863 Zygocystis clavata Lankester 1863: 94 



1887 Ckpsidrina granulosa Schneider 1887:74,77,78 



1899 Gregarina granulosa Labbe 1899: 11 



1903 Gregarina granulosa Minchin 1903: 334 



1911 Gregarina granulosa Wellmer 1911: 119 



Of the original observation by Kolliker only a single immature specimen 

 is illustrated which furnishes a clue to the identity of the parasite. The 

 sporont is short and stout, 30 by 16/i, the ratio of LP : TL :: 1 : 2.5; 

 WP : WD :: 1 : 1. The protomerite is dome-shaped with a small apical 

 cone and a deep constriction at the septum. The deutomerite is ovoidal 

 and the nucleus spherical with one karyosome. 



Intestine of Ephemera vulgata, larva. 



Taken at Zurich, Poitiers, France, and in East Prussia 



Kolliker records that Frantzius had found this species (1845) but 

 Frantzius' drawings (1848, PI. VII, figs. VII, 1, 2, 3, and 4) are very unlike 

 the figure of Kolliker (Fig. 89, this paper) and represent clearly the species 

 Gamocystis ephemerae. 



Diesing (1859) records: 



Receptaculum subhemisphaericum apiculo terminali conico. Corpus longe ovatum, lacteum. 

 Longit. 1/26 " ' ; crassit. 1/69 " ' . 



Schneider (p. 74) reports finding Gamocystis ephemerae and also another 

 gregarine: 



Le Gregarine qui domine qu'on trouve toujours dans ces larves, est la curieux Gamocystis 

 Francisci. Beaucoup plus rare et toujours en petit nombre est au contraire la Gregarine ac- 

 tuelle, qui se fait en revanche remarquer par une belle taille (518u le primite). 



It is characterized by the very large granules in the endocyte of the 

 protomerite. Chromidial inclusions in the deutomerite. Ratio LP< TL 

 :: 1 : 5 (Primite) to 1 : 9 (Satellite). WP : WD :: 1 : 1.5. The nucleus 

 is spherical, 5\yi in diameter with one karyosome 26/i in diam. The 

 sporont is cylindrical, the protomerite dome-shaped with a deep constric- 

 tion at the septum. The deutomerite is cylindrical with a shoulder and 

 truncate at the free end. 



