248 TRICHOMONAS VAGINALIS. 



who regards the ciliary comb as a long flagellum directed backwards, 

 and refuses to recognise the genus Trichomonas. — E. L.] On this 

 ground also, I believe that T. batrachorum not merely seems to have, 

 but really has, a vibrating membrane. I am further confirmed in this 

 opinion from the fact of an Infusorian with a ciliated border having 

 been formerly found by Eberth in the Lieberkiihnian glands of 

 the alimentary canal of hens and ducks (Fig. 124), which probably, 

 too, was nothing but a Trichomonas, in which the presence of the 

 flagellum was overlooked.^ 



Fig. 124. — Infusorians with undulating longitudinal membrane from the intestine of 

 the hen (after Eberth). 



Since Trichomonas batrachorum is, on account of its considerable 

 size, a much more convenient object than the human Trichomonas, we 

 may assume for the latter the same structure of the accessory ciliated 

 apparatus, although we must leave it to the future to justify this 

 procedure.^ 



Tricliomonas vaginalis, Donne. 



Donn^, "Kech. microscop. sur la nature du mucus :" Paris, 1837. 



Idem, "Cours de microscopie," pp. 157-161, Fig. 33, 1847. 



Kolliker und Soanzoni in Scanzoni's " Beitragen zur Geburtskunde," t. ii., pp. 131-137, 

 tab. iii.. Fig. 2 : Wurzburg, 1855. 



Hausmann, "Die Parasiten der weibliohen Geschlechtsorgane, " p. 42 : BerUn, 1870. 



Hennig, " Der Katarrh der iuneru weiblichen Sexualorgane," p. 66 : Leipzig, 1870. 



[Blochmann, "Bemerkungen iiber einige Flagellaten," Zeitschr. f. Wiss. Zool., Bd. xl., 

 p. 42, 1884 (with Fig.)]. 



This form has a somewhat bulging, oval body, on an average about 

 0'015 m,m. long, not including the terminal filament, which is half the 

 length of the body. The flagella, which do not exceed the whole body in 

 length, are geiwrally three in 7iiimber. The lateral undulating comb 

 reaches from the anterior margin to about the middle of the body, and 



' Stein, who expresses the same opinion, blames me for having ' ' immediately " made 

 a separate genus (Sacnolophus) of this parasite (see the first German edition of this work, 

 p. 140). In exculpation, I may state that at that time, when the structure of the acces- 

 sory ciliated apparatus of Trichomonas was still unknown, the Infusorian described by 

 Eberth stood completely isolated, and therefore had to be regarded as the representative 

 of a special genus. 



■^ [This has been confirmed by Blouhmaiin lloc. cU.'l — R. L.l 



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