NO. 16.] PROTOZOA ON THE ICE-FLOES OF THE NORTH POLAR SEA. 17 



By means of the cilium, b now took a small circuit, all the while in rapid 

 motion, while the movements had previously been slow and more amoeba- 

 like. It returned, however, to a and vibrated round it, as though linked to 

 the spot. After having observed this stage for some time, I was interrupted 

 by other observations (see below). 



When I returned I found the organism Fig. 8, whilst a had apparently 

 disappeared, it had probably again been enclosed by b. A stalk was also 

 visible by which the organism was affixed to the glass slide. Whether this 

 stalk had existed before under a (in Figs. 1 — 6) without being seen, it is 

 difficult to say, but it is hardly probable. The individual was vibrating 

 rapidly on its stalk by means of the cilium p. 



I had not observed it for very long before it began to divide (Fig. 9), 

 b being, as it were, skinned off from a by reversing. The a in this figure 

 had a striking resemblance to a in Figs. 1 — 6, it had the samme clear, refrac- 

 tive and sharply defined contents, in which three small globules or grains 

 were visible. After a while b had entirely separated from a except only for 

 a slender thread (Fig. 10). At the same time another immobile thread or 

 tail (h) was seen adhering to b besides the cilium. 



The thread fixing b to a was stretched and lengthened (Fig. II) 1 , 6 mov- 

 ing rapidly towards different sides; but then the thread was again shortened, 

 and b enclosed a (Fig. 12), as it were, for a last intimate embrace, before 

 finally parting, a was now entirely enclosed in b (Figs. 13 — 16; Fig. 15 

 drawn from above, and the stalk (s) not visible) and at last it could not be 

 distinguished any more; apparently it dissolved in the protoplasm of b. In 

 certain attitudes two threads (Figs. 16 and 17, h and h') could now be seen 

 attached to it; one of which may later have again disappeared. A longish 

 body now became visible in the interior of the cell (Figs. 17 — 20, k). This 

 body became more distinct and gradually changed somewhat in shape (PI. V, 

 Figs. 17 — 20, k, PI. VI, Fig. 1, k) at the same time as the organism changed 

 its outer form. Suddenly a reappeared inside the cell, and 6 again began 

 to separate from it (PI. VI, Fig. 2); soon after to leave it finally (Fig. 3). At 

 the same time a drop-like protuberance was formed on the side of a (Fig. 2 d). 

 I believed at first that it was simply a viscous drop, as a similar globule was 



1 The figures PL V, Fig. 11— PL VI, Fig. 10 are drawn with smaller magnification 

 (Zeiss obj. F, oc. 2) than PL V, Figs. 1-10 and PL VI, Figs. 11-19 (Zeiss obj F, oc. 4). 



3 



