30 Nr. 4. L. KoLDERUP ROSENVINGE: 
of the nemathecium, an intercalary division of the inner 
cells seems to take place; but this question deserves fur- 
ther investigation. Moreover, it is remarkable that the fer- 
tile cells in the cell-rows are sometimes connected with 
cells in the contiguous cell-rows by secondary pits, formed 
in the usual way by the cutting off of a small cell by a longi- 
tudinal wall of one of the cells and fusing of it with a 
cell in the contiguous row (fig. 14A). It should be of 
interest to study the fate of the migrating nuclei in this 
process. 
The sporangia are first divided by a transverse wall 
and some time thereafter by two vertical or slightly in- 
clined walls. They begin to ripen at the end of November, 
and nemathecia with ripe sporangia were met with in 
December to February. 
VI. The Germination of the Tetraspores. 
As mentioned above, DARBISHIRE obtained germina- 
tion of the tetraspores of Ph. Brodiwi and stated that they 
produce filaments and small more or less irregular cu- 
shions which he thought, in 1895, would develop to basal 
discs of Phyllophora Brodiwi under better conditions. 
For studying the germination of the tetraspores fresh 
material was dredged in the Great Belt at the close of 
November 1925. The nemathecia-bearing plants were brought 
home to Copenhagen, cleaned and put in glass-vessels 
filled with filtered sea-water from the Great Belt, covered 
with glass-plates and placed in an unwarmed room facing 
north (Nov. 26th 1925). In some cases a little potassic nitrate 
was added to the water. The plants were placed so that the 
spores dropped on slides deposited on the bottom of the 
vessels, in some cases on shells of Mytilus modiola. After 
