Fig. 1. Stylonychia (?) sp. Living, but motionless. From a lump of algae floating in a 

 channel between the floes about 2 metres deep. August 4, 1894. The small cor- 

 puscles inside the animal oscillated rapidly. During the drawing of it the animal 

 contracted, and the notch at the anterior end (left hand side of the drawing), dis- 

 appeared almost entirely. Then it again expanded and got the same appearance 

 as before, only the caudal bristle, pointing straight backwards in Fig. 1, had 

 now got a spiral winding as in Fig. 1, A. This twisting may possibly be clue to 

 the drop of Osmic Acid which was added to the preparation a couple of hours 

 before. 



Magnified 1280 diameters (Zeiss obj. F, 4; cam. luc). 



— 2. Stylonychia (?) sp. Killed with Osmic Acid. From the same place as above. 



August 4, 1894. The same species as above seen from the side. 

 (Zeiss obj. F, oc. 4; cam. luc). 



— 3. Stylonychia (?) sp. Living. From a pond on the ice. Taken July 28, 1894, and 



kept alive in a bottle till August 6, 1894 when it was sketched. Same species as 

 above, a seems to be small accumulations of food (small alga?), b is a small 

 vacuole just under the outer membrane; the small refractive grains were in a 

 strikingly rapid motion inside this vacuole. No longitudinal furrows could be 

 seen on this side of the body. Vi and v 2 big, clear vacuoles, but no pulsation 

 could be observed. A third vacuole could also be seen inside Vg, when the animal 

 moved, but it was not visible in this position; it seemed to be situated more on 

 the other side of the body. It was of about the same size as v 2 - While the 

 animal was being drawn, the thick bristles at c dissolved, as far as could be seen 

 into numerous slender threads or hairs. The two thick bristles at d, which at 

 first were undivided and pointed, now dissolved near the end into several threads 

 as is seen in the figure, and was finally transformed into a bundle of threads or 

 hairs. The thick bristles near a and Uj gradually disappeared, and this was also 

 the case with the hairs or cilia near the margin between e and y 3 . At e and on 

 the right hand side of t) 3 some dilapidated remains of hairs remained. While this 

 was going on the animal contracted somewhat in length, and assumed a rounder 

 shape; simultaneously two colourless water-clear drops were secreted, one in the 

 posterior end at V\ and one opposite u 2 , on the right hand side of the drawing. 

 The vacuole v 3 had in the mean time disappeared, and so had the small vacuole b, 

 or it had been much widened, for many of the small refractive grains were seen 

 oscillating and dispersed over a wider area. 



The animal is transparent and colourless with refractive, greenish globules dis- 

 persed chiefly in the exoplasm as usual. 



(Zeiss obj. F, oc. 4; cam. luc). 

 4. Stylonychia (?) sp. Same species as above, and from same place as Fig. 1 

 Aug. 4, 1894. Killed with Osmic Acid. 



Magnified about 1280 diameters (Zeiss obj. F, oc. 2; lengthened tube; cam. luc. 



Length of specimen 0040 mm. 



— 5. Stylonychia (?) sp. Same species as above, and from same place. Aug. 4, 1894. 



Killed with Osmic Acid. 



Length of specimen 0'038 mm. (Zeiss obj. F, oc. 1. cam. luc). 

 — 6. Chilodon (?) sp. Probably a species similar to PI. II, Fig. 4. From a lump of 

 algae floating nearly 2 metres deep in a channel between the ice-floes. Killed with 

 Osmic Acid. Length of specimen - 1088 mm. (Zeiss obj. CC, oc. 5; lengthened 

 tube; cam. luc). 



