but this is owing to the permanent Hght, day and night, that reigns in these regions during 

 the summer months. Even outside the polar circle as far south as Trondhjem the influence of 

 the northern summer is visible on the Lithothamnia. On the south coast of Norway, where 

 Foslie also collected Lithothamnia, they are as a rule much darker. 



The reef of Haingsisi was literally covered vvith knolls of L. eruèescens, as the two 

 text-figures show. The knolls were of very different size; we found little ones only i — 2 cm. 

 in diameter and other big ones that measured 9 cm. Often two or more knolls had grown 

 together and formed one big knoll; the living ones were red all round, the dead and the 



Lithothamnion-bank of Haingsisi. 



dying ones were totally or partially white. Other species and genera as Litliothamnion australe, 

 Lithophylhun Okamurai and Goniolitkon Reinboldi were also to be found, but they were 

 numerically of 110 importance compared with the ubiquitous L. eruöescens. 



This Lithothamuioii-hank. struck me because it is such a unique sight to see the ground, 

 as far as the eye can reach, covered by the pretty beautifully pink-coloured knolls, which are 

 heaped up so . close together that, while walking, one crushes them continuallv making a 

 peculiar noise as of broken china. We encountered however other and perhaps more instructive 

 Lithotha/////iou-ba.nks during our voyage. 



