138 PROCEEDINGS OF THE ACADEMY OF [PaRT I 



better not to mention them, as possibly they relate to some other 

 organism. 



Chrysopyxis bipes Stein. Plate VIll, figs. 45-49. 



"Chrysopyxis bipes has often been discussed in the literature, 

 and yet seems to me not to be at all well understood in its organi- 

 zation." Such are the words with which, in 1911 (30), Scherffel 

 begins his chapter about Chrysopyxis, and though the following 

 pages of the work threw a good deal of light on the most in- 

 teresting points, it will not be quite useless to report some further 

 observations here. But before relating my own experiences, I 

 should like to reproduce the lines with which Scherffel introduces 

 the subject: 



"According to the existing descriptions, Chrysopyxis is a fla- 

 gellated Chrysomonad, provided with a shell. According to Stein, 

 the animalcule is in possession of two flagella. Other observers, 

 like Lemmermann, and Pascher, are of the opinion that there is 

 only one flagellum. Iwanoff (1899) tried to explain these different 

 statements by the fact that normally a single flagellum exists, but 

 that this under special circumstances appears ravelled out in 

 threads, so as to look branched. The two flagella of Stein would 

 thus be reduced to a single branched one. Pascher (1909) accepts 

 Iwanoff's opinion, and gives in his Plate XI, fig. 26, a hypothetical 

 drawing of a specimen in which the individual threads of the 

 branched flagellum are wound up together at the base, and so ex- 

 plain the simple, thick, basal part of the flagellum. I had myself 

 a good many occasions to observe Chrysopyxis in life, but I never 

 succeeded in distinguishing an undulating flagellum, nor that 

 "ravelling into threads" (Zerfaserung) which Iwanoff and Pascher 

 speak of, and the existence of which I must confess to being very 

 skeptical about." 



Chrysopyxis is often met with, but my observations upon that 



interesting little Chrysomonad nearly all refer to a single station, 



that same shallow marsh at Pinchat where so many Protozoa have 



been found, and where in the spring of 1916 it was seen to cover 



in great numbers the long threads of Zygnema. 



The capsule (Plate VII, fig. 45), about 13[jl in length, is ovoid in 

 shape, and at the same time pyriform, its anterior extremity being 

 drawn into a very short tube, which, however, is hardly distinct 

 enough to deserve the name. This little case stands upright on 

 the vegetal filament, posteriorly drawn to one side in a very thin 

 thread which turns down around the Zygnema, and describes a 



