H. -M. WOODCOCK 11 



II 

 NOTES ON COPROZOIC FLAC4ELLATES 



H. M. WOODCOCK, D. Se. 



Fellow of University Collège. 



1. On the présence of an accessory flagellum in the genus Helkesimastix, 

 Woodcock and Lapage. 



In 1915, in collaboration with Dr. Lapage, I described^ the life-cycle 

 of a new type of coprozoic Flagellate, Helkesimastix faecicola, n. g., 

 n. sp. This remarkable form is characterized by tlie possession of a 

 long, trailing flagellum, in contact with the body of the Flagellate for 

 part of its lengtli. This disposition resembles that of the posterior 

 flagellum of Cercomonas, and differs from that of the trailing flagellum of 

 Bodo (syn. Prowazekia) and of Heteroynita. Unlike thèse forms, however, 

 Helkesimastix possesses no anterior, well-developed, vibratile flagellum, 

 which, by its vigorous' movement, causes the progression of the créa- 

 ture. 



We looked carefully and oftenfor another flagellum, because, as stated 

 in our paper, it was very difîicult to explain satisfactorily one variety 

 of movement shown by this i'IageUate. We were unable, however, to 

 détermine the existence of any additional flagellum and in our account, 

 therefore, we considered that there was only a single flagellum, namely, 

 the long, traiHng, one. This conclusion, I am sorry to say, was incorrect, 

 or perhaps I may put it, rather, incomplète. Helkesmastix inay possess, 

 also. a very short., accessory flagellum, comparable with that showni 

 by certain Moiias. 



1. Woodcock and Lapage. Proc. Roy. Soc. 88 B, p. 353. 



