The Norw. North-Atlantic Exped. 
19 
and a little depressed towards the oblong oral aperture. 12 rather 
short, thick, retractile tentacles, situated in a series. 
The colour: — The sheath has a deep beautiful chestnut- 
brown colour, having a violet play. The integument of the body 
salmon-red. The tentacles intense crimson-red ; the oral disc some- 
what paler in colour. 
In respect of the systematic position of these remarkable ani- 
mals, I must confess that I have been in great dubiety. One thing 
may be considered as certain, and that is, that they belong to the 
great animal-group of »Radiata«. There is nothing that points to 
a bilateral symmetry, not even a tendency to approach it is appar- 
ent in the developed animals, although the embryons, however, pre- 
sent such an indication. 
There were collected during the expedition, not so very few 
specimens of both genera, but the greater number were more or 
less injured by the dredge, so that I only obtained a couple of 
live specimens for my investigations. It was nearly 24 hours after 
the animals were placed in the glass vessels, before they began to 
show animation, by extending the tentacles. The ship, it is true, 
rolled a good deal, so that it was not altogether quiescent in the 
glass jars, but after a couple of days and nights Fenja mirabilis 
appeared to be in full vigour, and was then drawn and observed. 
Upon this observation, I arrived at the preliminary conclusion that 
I had to do with an Actinida, and that is was probably a Halcampa, 
for which reason I entered it as such, temporarily, in my Note- 
Book. The case was however a little different with Ægir frigidus; 
it was more sluggish in its movements, and first extended its tentacles 
after a longer interval, but altogether it did not appear to be at all 
comfortable, as it generally kept itself pretty much contracted; my 
observations, however, led in the distinct direction that, here, also, 
I had to do with an Actinida, that ought most properly to be as- 
signed to the Cerianthidæ, and as such, therefore, it was entered 
in my Note-Book. The specimens examined during life were care- 
fully preserved in alcohol, and it is therefore them that have prin- 
cipally served for my subsequent, more detailed, investigations. 
From these it results that we have, here, very remarkable transition 
forms to do with, that cannot, without difficulty, be assigned to 
the present existent established animal divisions. 
