FRIDTJOF NANSEN. [norw. pol. exp. 



the cell. Only at one place on the upper side of the cell, near x in Fig. 7, 

 was there an opening not covered by the globules where it was possible to 

 see into the interior. Here a small oblong body (as) was seen. When the 

 under side of the cell came into focus the red globules were again seen, as 

 indicated by the grey dots in the figure. Whether the open space (at as) was 

 a vacuole, could not be decided, as no movement was observed in it. 



The cell was surrounded by a membrane. 



No nucleus could be seen in the living specimens, as the oily globules 

 covered the interior from sight. It seems hardly probably that the open 

 space at as, could indicate the situation of the nucleus, as it was not defined 

 by any membrane. 



In a specimen killed with chromo-aceto-osmic acid, and stained with para- 

 carmine an oblong nucleus, about 0037 mm. long, 'was seen near the outer 

 membrane, on one side side of the cell. 



Forms of this alga like Fig. 8 (PI. VIII), with a furrow on one side, 

 were often seen. The structure was the same as in Fig. 7, but the oily glo- 

 bules were more closely situated, and made the cell still less transparent. 

 The globules near the furrow were colourless in this specimen. The diameter 

 of the cell was Oil mm. It is possible that this form with the furrow has 

 been produced as the result of violence from outside. 



I got no time for studying the life of this alga, and can therefore say 

 nothing about its development, or process of multiplication. 



