79] STUDIES ON GREGAR1NESKAMM 79 



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

 species Pikocephalus chinensis by Schneider in 1886 and in Acanthospora 

 polymer pha by Le"ger 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 panus Wellmer Ceratopsyllus fringillae (Wlk.) 



C. gaUinae (Schrank), larvae 

 Steinina rotunda Ashworth and Rettie Ceratopsyttus sty* Roths. 



GEKUS OF UNCERTAIN POSITION 



Agrippina bona Strick. Ceratophyttus fasciatus Bosc. larv. 



Family 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 140^ by 75/i. 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 fringillae (Wlk.), larva (Ceratophyttus /.) ; 

 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^ by 80/i. Nucleus spherical, one or two large 

 karyosomes. 



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

 rupture. Spores ovoidal, 12/t by 7/t. Extracellular development. Intes- 

 tine of Ceratopsyttus styx Roths. (Ceratophyttus s.) 



Taken near Edinburgh. 



