Fig. 13. a — c. Living. From a pond on the ice. July 29, 1894. Conjugation (?) of small 

 oscillating infusoria, of a similar appearance as Figs. 15, but they were smaller 

 so that no cilia could be distinguished. They united during rapid oscillating 

 movements, the one athwart the other, with the flat ventral (?) sides against each 

 other. Thus united they walzed rapidly around for a while; then the movements 

 ceased, and the one assumed a rounder shape in longitudinal aspect (see Fig. 

 13 c, the upper individual), a and c are seen from the side, 6 from above (Zeiss 

 obj. CC, oc. 5; freehand sketches). 



— 14. Chilodon (?) sp. Living, but motionless. From a pond on the ice. July 28, 1894. 



Perhaps the same or nearly allied species as Figs. 1—6 (?). 

 Magnified 460 diameters. (Zeiss obj. CC, oc. 5; cam. luc). 



— 15, a — c, and 16. Living. From a pond on the ice. July 29, 1894. An individual 



seen in different positions: a obliquely from behind, b from the side, and c from 

 above. This figure should be more regularly oval than it is here reproduced. The 

 animal had apparently a flat ventral side, and a vaulted dorsal side. Ventral side 

 densely covered with long cilia; on the dorsal side shorter cilia were also visible. 

 One apparent vacuale was visible. At first the animal was in active motion, 

 affixed, as it seemed, by some mucuous threads or cilia to the silica spicule of a 

 diatom, and it could therefore advance only slowly. After some time the move- 

 ment ceased gradually, and its shape become more rounded (Fig. 16). Several 

 refractive drops were then secreted (Fig. 16, d), and its size was reduced. After 

 a while the motion became again more rapid, and during its rotalions it was now 

 seen that the flatness on the ventral side had nearly disappeared and it had got 

 a more oval or nearly globular shape. 



Magnified 460 diameters (Zeiss obj. CC, oc. 5; cam. luc). 



