NO. 16.] PROTOZOA ON THE ICE-FLOES OF THE NORTH POLAR SEA. 15 



it is not as globular as is the above form, and further the spiral-windings 

 are very prominent". 



To this description from my note-book I may add that it may be pos- 

 sible that this was simply an individual of the same species as above, only 

 less filled with foot. 



In the reproduction of Fig. 13 there are a few mistakes. On my ori- 

 ginal drawing there were many cilia pointing backwards in the anal region, 

 which have been forgotten here. The cilia on both sides of the body are 

 in my original orawing situated in the spiral furrows, and not on top of 

 the ribs. 



Both figures (13 and 14) are drawn without the aid of camera lucida, 

 and with' comparatively small magnification. 



CHILODON(?) sp. 



PI. II, Figs. 1-4; PI. Ill, Figs. 1-7, 9, 14. 



This form seemed allied both to Orthodon and Chilodon. It was not, 

 as far as I could see, uniformly covered with cilia, but had its cilia arran- 

 ged in a double series round along the length of the amind (PI. Ill, Fig. 5). 

 This infusorium was very common in the accumulations of algae in the ponds 

 of fresh-water on the ice-floes where it moved rapidly about. As it occurred 

 sometimes in ponds on comparatively clean and white ice-floes, it seems pro- 

 bable that the animal did not originate from anywhere near the land, for 

 such ice-floes had been formed on the sea, during the previous autumn and 

 winter, far from the coasts. 



For a description of this infusorium the reader is referred to Pis. II and 

 III and the Explanations of these Plates. 



It is perhaps doubtful whether several species were observed. PI. II, 

 Fig. 4 was much larger than the species reproduced in PI. II, Figs. 1—3 and 

 PI. Ill, Figs. 1 — 7, and possibly belonged to a different species. The usual 

 length of the individuals was about 0*05 mm. or a little more, whilst PI. II, 

 Fig. 4 was - 099 mm. long. 



PI. Ill, Figs. 9 and 14, were somewhat smaller than the above individuals, 

 they were about 0'043 mm. long but possibly belonged to the same species 

 or a similar species. 



