C. M. Wen yon 
215 
doubt upon the so-called Trichomonas cysts of Bohne and Prowazek men¬ 
tioned above. These so-called cysts have been frequently encountered in 
the faeces of man and other animals, but it is interesting to note that in 
a previous work by the present writer on the Trichomonas of the mouse, 
though these flagellates often occurred in enormous numbers, no such 
cysts were met with. 
The flagellate described in this paper shows undoubted affinities 
with Trichomonas and Trichomastix. Quite recently, under the name 
of Macrostoma caulleryi, Alexeieff has described a similar flagellate from 
the intestine of tadpoles. The shape of the body, the three anterior 
flagella and the large cytostome are features common to both forms. 
Alexeieff does not describe an undulating membrane within the cyto¬ 
stome as in the human form. It is just possible that this has been 
overlooked so that the new genus Macrostoma created by Alexeieff for 
the tadpole flagellate would also include the human form. For the 
human form the name Macrostoma mesnili may be suggested. 
The presence of this flagellate in the intestine was productive of no 
ill effects, its presence being noted only in the routine examination of 
the faeces. 
REFERENCES. 
Alexeieff, A. (1909). Les Flagelles parasites de l’intestin des Batraciens indigenes. 
G. R. Soc. Biol, lxvii. p. 199. 
Bohne, A. und Prowazek, S. (1908). Zur Frage du Flagellatendysenterie. Arch, 
fur ProtistenTcunde , xii. p. 1. 
Bensen, W. (1909). Uutersuchungen iiber Trichomonas intestinalis und vaginalis 
des Menschen. Arch, fhr Protistenhunde, xvm. p. 115. 
Wenyon, C. M. (1907). Observations on the Protozoa in the intestine of mice. 
Arch, fur Protistenkunde, Suppl. I. p. 184. 
Ucke, A. (1908). Trichomonaden und Megastomen im Menschendarm. Centralbl. 
fur Baht, und Parasit. xlv. p. 231. 
Dobell, C. C. (1908). Some Remarks upon the “autogamy” of Bodo lacertae 
(Gra-ssi). Biologisches Centralblatt. xxvm. p. 548. 
14—2 
