47 
at hand that animals, which are so liable to be damaged by their 
natural surroundings, should. possess the power of repairing such 
damages, it has hitherto been thought that they are destroyed in 
that way. Chun thus says (Dissogonie; p. 103): ”Sie sind voll- 
» auf den Gefahren ausgesetzt, welche Wind und Wellenschlag in 
Gefolge haben. Bei jedem Sturme werden sie zerfetzt und massen- 
haft vernichtet; es dauert nach stirmischen Zeiten oft eine Woche 
bis man unter dem iberreichen Material von Bruchsticken wieder 
vållig intakte Exemplare entdeckt”. I was then very anxious to 
See whether it would be possible to keep such "Lesueuria”-spec- 
imens and get them to assume again the Bolina-shape. It did not 
last long time, before I succeded in giving the proof that my 
suggestion was right that Lesueuria is really nothing. but a lace- 
rated Bolina. One of the first days of my stay at the Trondhjem- 
station the director, Dr. Nordgård, made a haul with a large 
plankton net in deep water in order to get Ctenophores for me. 
Å good deal of specimens of Bolina were captured, and all were 
More or less lacerated through the capture. These lacerated spec- 
imens, among which some had lost the lobes completely, being thus 
typical "Lesueurias”, were placed in a large jar in the laboratory. 
It was on the 13th July. Already the 15th all of them were 
distinetly in the course of regenerating the lost parts — lobes, 
tentacles, auricules or ribs. On the regenerating lobes it was 
especially noticeable: that a great number of cells had collected 
there, apparently with the destination to afford the material for 
building up the regenerating part of the body. From the two sub- 
Sagittal meridional vessels some irregular, anastomosing vessels 
Passed into this mass of cells, and the nutritive fluid of the gastro- 
Vascular system was seen to pass through them. These irregular 
vessels disappeared by and by completely, contemporaneously with 
the development of the normal lobe-vessels. 
In the course of only 5 days all the specimens had fasenbreel 
the lost parts nearly completely. Having obtained this result, 
by which the definite proof was given that Lesueuria is really 
