342 Hartog . — On a Monadine parasitic 
and forms its zoocyst unaffected by the presence of the 
Chytridian. 
As stated above, the species I have described differs little 
so far from Cienkowski’s type P . parasitica ; and I should not 
have ventured to separate it but for one reason : the type- 
species preys on Desmids and Conjugates ; ours never attacks 
green Algae (nor Phycochromaceae) unless they be previously 
injured : this point I have made out by observation. 
As to its systematic position. Following Cienkowski and 
Zopf, this must belong to the Monadineae Zoosporeae, pos- 
sessing mastigopod zoospores. This is divided by Zopf 
into three orders : Plasmodiophoraceae, Gymnococcaceae, and 
Pseudosporaceae. In the absence of resting-spores we can 
only affirm certainly that it does not belong to the first ; but 
from its extreme likeness to Pseudospora parasitica C. it is 
almost certainly a member of the same order and probably 
the same gtnus. I define it thus : 
‘ Pseudospora (?) Lindstedtii mihi. Monadinea Zoosporea, 
zoosporis oblongatis 1-3 flagellatis, postea Heliozoi habitu 
nec in plasmodia coalitis ; Zoocystis massa faecali excentrica 
vacuolo spherico circumdata praeditis, 4-16 (plerumque 8-) 
paris ; in hyphis Saprolegniearum diversarum (. Leptomiti , 
Saprolegniae , Acklyae ), nec in algis viridis v. cyaneis para- 
sitica ; sporis “ quiescentibus ” dictis adhuc ignotis.’ 
We may now revert to the position it has taken in the 
Saprolegnia-fertilisation controversy. 
Pringsheim, as mentioned above, states that certain portions 
of the antheridial protoplasm of Saprolegnieae become special- 
ised and escape as spermamoebae to fertilize the oospheres. 
Zopf in a series of theses gives the following account. 
Numerous minute amoebae appear in the antheridium of 
Saprolegnieae at the time of fertilization, pass into the 
antheridial tubes and apparently disappear on arriving at 
the oospheres. The oospore shows however changes due to 
the infesting parasite, manifested in the appearance of numer- 
ous fat-globules finally coalescing into a single lateral drop. 
The protoplasm and wall of the oospore thus affected show 
