314 Dr. R. v. Willemoes-Suhm on some 
The following is a list of all the depths from which Umbel- 
lularia has been brought up :— 
1. Off the coasts of Greenland: 236 fathoms (Adrians), 
410 and 122 fathoms (Lindahl). 
2. In the Atlantic: 1600, 1800, and 2150 fathoms. 
3. Inthe Antarctic sea: 1375, 1600, 1975, 1950, and 2600 
fathoms. 
In the Pacifie in 2440 tathoms. 
The greatest depth at which this Expedition procured Um- 
hellularia is accordingly 2600 fathoms, the least 1375 fathoms. 
It is usually associated with such decidedly deep-sea animals 
as Ophioglypha, Brisinga, Pourtalesia, Ananchytids, Munop- 
sids, Petalophthalmus, Gnathophausia, Macrurus, &c. 
After these remarks on its geographical distribution as far 
as it is known to us at the present moment, I shall proceed to 
give a few details on its young stages, which were found at 
station no. 3 in the Antarctic sea, and which show, better than 
the full-grown specimens of Lindahl and Kélliker, the very 
marked bilateral symmetry of the polypary and the order in 
which the polypes succeed each other. 
Lindahl has given, on page 8 of his paper, an ideal sketch 
of what he thinks to have been the successive appearance of 
the polypes on the polypary. According to him, the oldest or 
terminal polyp (Tin his and in my figures) remains during the 
first five stages at the top, above the others. Then only the 
lateral polypes (1. and 11.) come forth, and two of them advance 
to the top, while the terminal one is removed towards the 
centre. 
In the Greenland species of Umbellularia this may be 
perfectly correct, but in the Antarctic species, of which we 
actually got the young stages, the mode of growth is a little 
different. This will be confirmed by a glance at my figures. The 
smallest specimen (PI. XVIII. A. fig. 1), having only a length 
of 41 millims.,shows clearly that here also a terminal polype (Tr), 
which is 2 millims. longer than the lateral ones, has first made 
its appearance. The lateral ones have come out a little later, 
but both at the same time, not the right one earlier than the 
left, as is supposed in Lindahl’s diagrammatic figures. The 
same stage is represented by a larger specimen (fig. 3), length 
100 millims., in which the terminal polype is still the largest, 
but in which the lateral ones are already nearly of the same 
size. The reason why in this large specimen there are only 
three polypes, while a much smaller one now to be described _ 
has already four, is probably want of food. 
The first change which takes place is the coming out of 
