NO. 16.] PROTOZOA ON THE ICE-FLOES OF THE NORTH POLAR SEA. 21 



show a slightly vibrating movement, see PI. VI, Fig. 20, 6 and c. Whether 

 a (Fig. 20) had also originated from the above organism, I could not say for 

 cerlain; it was lying between some of these globules and had the same ap- 

 pearance, but gradually began to move away by means of its cilium. 



The small grains (Fig. 3, a) which had been squeezed out with the cell 

 contents, appeared to have grown in size during the afternoon, and were 

 darker than the bigger globules. I did not directly see, that any of them 

 began to move, but they had a striking resemblance to many small dark glo- 

 bules which were seen vibrating between the greater globules. 



PI. VI, Figs. 20, d, was a body which was in rapid vibration near some 

 of these globules. 



GLOBULAR ALGA. 



PI. VIII, Figs. 7-8. 



I have mentioned above (p. 7) that, in July and first days of August, 

 1894, numerous globular lumps of algae were floating in the channels between 

 the ice-floes, at a depth of about 1 metre; somewhat deeper in August, per- 

 haps nearly 2 metres. These lumps were composed of diatoms, and to a large 

 extent, also of a yellowish-red globular alga, of considerable size. This alga, 

 when alive, gave the floating lumps a reddish colour, and the colour was 

 the deeper the more numerous were the algae. 



The diameter of this alga (PI. VIII, Fig. 7) was generally between 010 

 and 0'16 mm. 



Its cell contents were surrounded by a layer of yellowish red refractive 

 globules (see Fid. 7), situated near the membrane. These globules varied 

 somewhat in size. They gave the alga its reddish colour, and were formed 

 by an oily substance, which was blackened by osmic acid. While Fig. 7 

 was being drawn, and when the alga probably began to die, the oily glo- 

 bules united and became continually larger until they fused into one mass 

 which left the cell as big reddish drops; the cell-contents then became en- 

 tirely colourless. These globules, were as already mentioned, dispersed 

 in the outer layer of the cell-contents, while its interior was transparent and 

 colourless. The red globules were, however, as a rule lying so close 

 together, that it was impossible to see through them into the interior of 



