Note 36 — ON PARASITES IN GENERAL. (continued 2)
Reading edition
To explain this discrepancy it is stated that the border of the undulating membrane can be detached in the form of an independent flagellum. But Parisi (1910) places such quadriflagellate forms in the sub-genus Tetratrichomonas, Arch. f. Protistenk., xix, p. 232.