76 ILLINOIS BIOLOGICAL MONOGRAPHS [76 



Leger places the species positively in the genus stated: 



Ces caracteres, (the epimerite as described above) joints i ceux fournis par la forme du spora- 

 din du kyste et des spores, font renter, sans aucun doute, cette Gre"garine dans le genre 

 Actinocephalus. 



ACTINOCEPHALUS sp. Leger 



1899 Actinocephalus sp. Le"ger 1899: 532 



1903 ? Actinocephalus sp. Minchin 1903: 333 



Host: Ctenophora sp., larva. 



This species is not described, but merely mentioned in a list of other 

 species found by Leger. 



Genus SCHNEIDERIA Leger 1892: 153 



Sporonts solitary. Protomerite separated from deutomerite by 

 constriction but no septum (pseudomonocystid). Epimerite a flat disc 

 with milled border, with or without central spine. Cyst dehiscence by 

 simple rupture. Spores biconical, smooth. (It might be possible that a 

 septum exists in the young trophozoites although this is not suggested 

 by L6ger.) 



SCHNEIDERIA CAUDATA (von Siebold) Leger 

 [Figures 4 and 5] 



1839 Gregarina caudata von Siebold 1839: 51 



1845 Gregarina caudata Dujardin 1845: 638 



1846 Gregarina caudata Frantzius 1846: 23 

 1848 Actinocephalus caudatus Frantzius 1848: 195 

 1851 Gregarina caudata Diesing 1851:8 

 1859 Gregarina caudata Diesing 1859: 729 

 1863 Gregarina caudata Lankester 1863: 94 

 1875 Gregarina caudata Schneider 1875: 591 

 1892 Schneideria coronata Leger 1892: 155 

 1899 Schneideria caudata Labbe 1899: 22 



1903 Schneideria caudata Minchin 1903:337,199 



Sporonts solitary, elongate. Maximum length 1 mm. Ratio LP:TL: : 

 1:9; WP:WD: :1.1 : 1. Protomerite flattened at apex, wider than high, 

 widest in middle, constricted considerably to meet deutomerite but no 

 septum present. Deutomerite long, slender, tapering from anterior end, 

 a very long conical extremity. Epimerite a flattened disc with a milled 

 border, ho style in center, as in 5. mucronata. Nucleus slightly ellipsoidal, 

 one large karyosome. 



Cysts not seen. Spores 20 by 10^. 



Intestinal caeca of Sciara nitidicollis Meig., larva. 



Taken in Poitou, France. 



