16 FRIDTJOF NANSEN. [norw. pol. exp. 



PI. IV, Fig. 6 probably also represents a species allied to the above in- 

 fusoria (PI. II, Figs. 1 — 4). It was taken from free-floating lumps of algae, 

 in a channel between the floes, and was of about the same large size as 

 PI. II, Fig. 4 which it resembled much. Its length was 04088 mm. 



PI. Ill, Figs 10 — 13 and 15—16 represent small animals which were often 

 seen in preparations from accumulations of algae in the ponds. They pos- 

 sibly belong to similar species as the above infusoria. For description see 

 Explanation ot the Plate. 



STYLONYCHIA(?) sp. 



PI. IV, Figs. 1-5. 



This infusorium was often seen moving rapidly about both in the accu- 

 mulations of algae from the ponds on the ice, and in the yellowish red lumps 

 or communities of algae floating at a certain depth (about one or two metres) 

 in the channels between the floes. For description see Explanation of the 

 Plate. 



The species seems to be at least nearly allied to the genus Stylonychia 

 but it does not perfectly agree with the descriptions of the latter. 



ORGANISM REPRESENTED PIS. V AND VI. 



While I was examing the big organism represented in PI. VIII, Figs. 

 1 — 3, a small organism came slowly "padling" into the microscopic field. It 

 was oblong and, with the small magnification I then had, seemed to resemble 

 exactly, the individual reproduced in PI. V, Fig. 7, A. I changed objectives 

 to look at it under higher magnification (Zeiss F, oc. 4) but it was imposible to 

 find it. Instead, I found on the same spot the organism reproduced PI. V, 

 Fig. 1. At first this individual did not move; but gradually the protoplasmic 

 part, b, began to contract (Figs. 2 & 3), and then to separate from the more 

 refractive part, a (see Fig. 4). It soon separated entirely and moved away 

 from a (Fig. 5). Then a cilium also suddenly became visible, which had not 

 been seen previously. At the same time b got a more regular oval form 

 (Figs. 5, 6), and a longitudinal line was seen along the the middle, dividing 

 the contents into two parts with a round corpuscle or vacuole in each (Fig. 6, b). 



