318 



H. M. WOODCOCK. 



hand and from Spirillum on the other, as the type of a new 

 genus Spironema. 



A few weeks subsequently to Schaudinn's paper Krzysztalo- 

 wicz and Siedlecki published a remai'kable account (147) of 

 this same parasite. While agreeing as to its finely tapering 

 and pointed appearance, which furnishes a ready means of dis- 

 tinguishing this organism from S. ref ringens, these authors 

 consider that this is not due to the presence of flagella, but 

 to the body itself being drawn out like a filament at both 



Fig. G5. — Spironema pallidum (Scliaud.) = Trypanosoma 

 luis, K. and S. a, indifferent, (Spirochoeta-) forms; c and d, 

 stages in division of same ; h, an indifferent form shortened and 

 thickened, leading on to the " Trypanosome "-phase (e); /, elon- 

 gated compound (multinuclear) form, whicli divides into several 

 little sickle-shaped uninuclear individuals {g)\ h, conjugation of 

 male and female elements. (After Krzjsztalowicz and Siedlecki.) 



ends. K. and S. find that, in the course of its movements, 

 the parasite may contract itself considerably, and become 

 much shorter and thicker (fig. 65 6.) ; even in this condition, 

 however, one or both extremities remain attenuated and 

 pointed. At such times Spironema greatly resembles a 

 little Flagellate such as Micromonas. In both tliese 

 phases complete longitudinal fission takes place (fig. 65 c) ; 

 the parsites may remain for some time attached end-to-end 



