NOTES ON SOME PARASITIC PROTISTS. 121 
Notes on some Parasitic Protists. 
By 
C. Clifford Dobell, B.A., 
Scholar of Trinity College, Cambridge. 
With Plate 6. 
Durine the last few years the Bacteria and their allies 
have engaged the attention of so many workers, have caused 
so much controversy, and have proved to be of such great 
interest—phylogenetically and otherwise—that I believe any 
observations, however small, which would supplement our 
knowledge of their cytology or life-history, are much to be 
desired. With this conviction I offer these few imperfect 
notes on some of the more interesting protists which have 
come under my observation from time to time. 
I. Bacillus flexilis, n.sp. (Pl. 6, figs. 1—19.) 
More than five years have now elapsed since the appear- 
ance of Schaudinn’s epoch-making paper on Bacillus 
biitschlii, a parasite of the common cockroach, P. orien- 
talis. Yet, apart from Schaudinn’s own further researches 
on the Bacteria, no similar life-history has since been recorded. 
However, I can now record the existence of an organism 
which in many respects exhibits a remarkable similarity 
to B. biitschlii. 
I propose to name this organism Bacillus flexilis, n.sp., 
although I must point out that I do not believe it should 
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