154 AQUA TIC PH YCOM YCETES 



? Olpidium tuba Sorokin 

 Arch. Bot. Nord France, 2: 33, fig. 39. 1883 (separate) l 



Sporangium broadly ellipsoidal, its long axis parallel with that of 

 the alga, wall thin, smooth, colorless, discharge tube arising from one 

 end. swollen beneath and on the outer surface of the algal wall, con- 

 stricted where passing through the wall and terminating in a short 

 narrow isodiametric part; other characters not observed. 



In "Confervacies," European Russia, Asiatic Russia. 



/// Microscopic Animals 



? Olpidium arcellae Sorokin 



Arch. Bot. Nord France, 2: 34, fig. 40. 1883 (separate) 2 



Sporangium spherical or subspherical, wall thin, smooth, colorless, 

 with a long, isodiametric, slightly curved or undulate discharge tube 

 which emerges through the pseudopodial opening of the animal shell; 

 other characters not observed. 



Saprophytic (?) on the protozoan Arcel/a, European Russia. 



? Olpidium (?) difflugiae Scherffel 

 Arch. Protistenk., 54: 168, pi. 9, fig. 1. 1926 



Sporangium broadly pyriform, 23 \x long by 15 ;jl in diameter, with 

 a thin colorless smooth wall, discharge tube consisting of a broadly 

 conical papilla which does not emerge from the host cell; other fea- 

 tures not observed. 



In Difflugia sp. (Rhizopoda), Hungary. 



Said to differ from Olpidium arcellae Sorokin and O. gregarium 

 in the lack of a well-defined discharge tube. Just how much sig- 

 nificance is to be attached to this difference is doubtful, since from 

 the figure given the sporangium appears immature. It seems probable 

 that the tip of the discharge tube eventually becomes extramatrical. 



? Olpidium leptophrydis Scherffel 



Arch. Protistenk., 54: 171, pi. 9, fig. 8. 1926 



Sporangium spheroidal, wall thin, smooth, colorless, forming a 



1 Ibid., 136, pi. SO fig. 97. 1889. 



- Ibid., 137, p|. 80, figs. 102-105. 1889. 



