33J STUDIES ON GREG A RINES—KA MM 33 



DIDYMOPHYES LONGISSIMA (von Siebold) Frantzius 



1839 Gregarina longissima 



1848 Didymophyes longissima 



1848 Gregarina longissima 



1851 Gregarina longissima 



1859 Gregarina longissima 



1863 Gregarina longissima 



1886 Gregarina longissima 



1895 Gregarina sp. 



1899 Didymophyes longissima 



1903 Didymophyes longissima 



1911 Gregarina longissima 



Sporonts very elongate, cylindrical, vermiform in movements. Ratio 

 LP : TL : : 1 : 30 ; WP : WD : : 1 : 1 . Primite longer than satellite. Dimen- 

 sions not given (Kolliker). Nucleus small, spherical, one large karyosome. 



Intestine of Gammarus pulex von Siebold, Orchestia littorea. 



Taken in Germany. 



The species was first described by von Siebold, who also found another 

 species in Gammarus pulex, typically like the Cephaloidophoridae in outline 

 but regarded by him as another form of the same species. 



Kolliker studied fresh material adding the data that associations exist 

 of two or three elongate slender individuals arranged in single file and of 

 two satellites attached to the posterior end of the primite. Kolliker recog- 

 nized the possibility of a new species being involved in von Siebold' s 

 material and illustrates this as well as the two modifications mentioned in 

 the type species. 



The exclusion of the doubted form was also recognized by Diesing 

 (1859). 



Lankester (1863) regards all the following as synonymons: 



Gregarina longissima Siebold 



? Gr. diffluens Diesing 



Gr. miliaria Diesing (Actinocephalus Stein) 



Gr. putanea Leuckart 



Gr. Gammari Siebold (Didymophyes Stein) 

 His basis was the identity of the hosts only. 



Plate found in the intestine and coelom of Gammarus pulex "band- 

 formig" gregarines 255jLi in max. length, three or four attached together 

 and regards them as belonging to the species in question. 



Minchin (1903) questions the inclusion of the last named host as 

 authentic. 



