79] STUDIES ON GREGARINES—K AM M 79 



protomerite (a phenomenon which has been nowhere else except in the 

 species Pileocephalus chinensis by Schneider in 1886 and in Acanthospora 

 polymorpha by Leger in 1897). 



Cysts spherical. 



Development extracellular, no cell destruction. 



Intestine of Ptychoptera contaminata, larva. 



Taken in Belgium? 



LIST OF SPECIES FOUND IN THE ORDER SIPHONAPTERA OF 

 THE CLASS HEXAPODA 

 Parasite Host 



actinocephalidae 



Actinocephalus parvus Wellmer Ceratopsyllus JringiUae (Wlk.) 



C. gallinae (Schrank), larvae 

 Steinina rotunda Ashworth and Rettie Ceratopsyllus styx Roths. 



GENTJS OF UNCERTAIN POSITION 



Agrippina bona Strick. Ceratopkyllus fasciatus Bosc. larv. 



FamUy ACTINOCEPHALIDAE Leger 1892: 166 . 

 Genus ACTINOCEPHALUS Stein 1848: 196 

 ACTINOCEPHALUS PARVUS Wellmer 

 [Figures 114 and 120] 



1911 Actinocephalus parvus Wellmer 1911:131 

 Sporonts ovoidal, maximum dimensions 140ju by 75m- Ratio LP:TL: : 



1:5; WP:WD: :1:1.3. Nucleus ovoidal, several karyosomes. Epimerite 

 a corona of eight digitiform processes situated upon a short neck. 

 Cyst and spores unknown. 



Intestine of Ceratopsyllus JringiUae (Wlk.), larva {Ceratopkyllus /.); 

 and C. gallinae (Schrank), larva. 

 Taken at Konigsberg. 



Genus STEININA Leger and Duboscq 1904: 352 

 Epimerite a short mobile digitiform process changing into a flat 

 button. Spores biconical. 



STEININA ROTUND ATA Ashworth and Rettie 

 [Figures 121, 122, 123 and 124] 



1912 Steinina rotundata Ashworth and Rettie 1912: 31 

 Sporonts solitary, obese to pyriform. No constriction at septum. 



Maximum dimensions 180/1 by 80^. Nucleus spherical, one or two large 

 karyosomes. 



Cysts spherical, 110/i to 185^ in diameter. Dehiscence by simple 

 rupture. Spores ovoidal, \2n by 7/i. Extracellular development. Intes- 

 tine of Ceratopsyllus styx Roths. (Ceratopkyllus s.) 



Taken near Edinburgh. 



