359] STUDIES ON GREGARINES— WATSON 149 



Cysts spherical, 300 to 400/* in diameter, dehiscing by simple rup- 

 ture. Spores biconical, swollen in middle, 10.5 by 6.75/*. 



Taken at Poitiers, France. Host: HydrophUus piceus (L.) larv. 

 Habitat : Intestine. 



Labbe included with this species, as a synonym, Kolliker's Greg- 

 arina hrevirostra (1848:12), probably because of the similarity in 

 hosts. Kolliker's species shows a 'proboscis' as does Leger's, but one 

 much shorter and differently shaped. The former is a short xiphoid 

 cone, only half the length of the protomerite ; the latter a long cylindri- 

 cal process, three times the length of the protomerite. The latter is re- 

 tractile, but KoUiker does not mention that this is true of his species. 

 His drawing does not indicate the circular distal collar armed with 

 teeth. I am inclined to think the species are quite distinct, and have 

 therefore placed Kolliker's species in the genus Stylocephalus. For 

 further description, see under the heading Stylocephalus brevirostris 

 (KoUiker). 



PILEOCEPHALUS BERGI (Frenzel) Labbe 



[Figure 83] 



1892 Gregarina lergi Frenzel 1892 :286 



1899 PUeocephalus lergi Labbe 1899 :20 



Pileocephalus : Sporonts solitary, barrel shaped. Length of larg- 

 est 330/A, width 90/i. Ratio length protomerite : total length : : 1 : 5.2 ; 

 width protomerite : width deutomerite : : 1 :1.6. Protomerite hemis- 

 pherical, evenly rounded, 1.7 times wider than high, slight constriction 

 at septum. Deutomerite broadly ellipsoidal, wider in middle, broadly 

 rounded, nearly flattened posteriorly. Epimerite a large hyaline cen- 

 trally dilated and sharply pointed cone half the length of the whole 

 cephalont without the epimerite. Nucleus spherical with one large 

 karyosome. Endocyte dense, gray to black. 



Cyst and spores unknown. 



Taken at Cordoba, Argentina. Host: Necrobia ruficollis Fabr. 

 (Corymetes ruf.). Habitat: Intestine. 



