I 



t was a pleasure to see Sarsia princeps, the largest of the 

 Sarsiadae and an inhabitant of the ice-bound skores of Greenland 

 and Spitzbergen. It has all the characters of a Sarsia and I cannot 

 agree with Haeckel in placing it in the genus Codonium. It would 

 be better for the study of the geographical distribution of animals 

 if the genus Codonium were abolished. 



Tbe new species of Margelopsis should have a free-swimming 

 hydroid, and its discovery on the coast of Norway would be a 

 valuable addition to our knowledge of this remarkable genus. 



The new Margelis is apparently without ocelli, but it is not 

 the sole exception, as another species of the genus has been found 

 by Mater off Florida in the same condition. 



The description of Mitrocomella fulva is based upon two specimens 

 tåken far apart, Plymouth and Byfjord near Bergen. It is an 

 addition to a genus which previously contained only a single species. 



Aequorea norvegjca may perhaps turn out to be an unnecessary 

 addition to this genus. There are probably already more species 

 described of this kind of medusa than do really exist in the sea. 

 This is partly due to the imperfect descriptions of the earlier writers, 

 and partly to the great changes taking place in the natural course 

 of development, which have in some cases led to the production of 

 spurious genera and species based upon stages in the life-history 

 of one species. It is perhaps better to err in describing a species 

 as new than to extend the geographical distribution of an old species 

 to within the Arctic circle. I have found that the basal bulbs of 

 the tentacles are a great assistance in determining species belonging 

 to the Aequoridae, especially when dealing with the early and inter- 

 mediate stages. 



By far the most interesting medusa in the collection is 

 Ptychogastria polaris, which is better known by the name of 



