20 
The Samso area. Sa The boundary towards the Little Belt is a line from 
Æbelø to Bjornsknude and towards the Great Belt a line from Fyens Hoved 
to Refsnæs Point. 
The Little Belt (Lillebælt). Lb. The boundary to the south is a line from 
Pels Huk on Als to Vejsnæs on Æro, and towards the South Fyen waters a 
line from Hornenæs to Skjoldnæs. 
The South Fyen waters (Sydfynske ®gaard). Sf. The boundary towards 
the Great Belt is a line between Turø Reef and Næs Hoved on Langeland. 
The Great Belt (Storebælt). Sb. The boundary to the south is a line between 
Gulstav at Langeland and Kappel church on Lolland, towards the Smaaland 
Sea a line from Korsør passing Egholm, Agerse, Omø and the south-westerly 
Omø Staal Grund to the eastern point at Onse Vig in Lolland. 
The Smaaland Sea. Sm. The boundary towards the Baltic off Grønsund is 
a line round Tolken, towards the Baltic off the Bogestrom a line round the 
sand shallows to the Bogestrem buoy. 
The Sound (Øresund) Su. The boundary towards the Baltic off Grønsund is a 
line from the south point of Amager eastward. 
The western Baltic. Bw. To a line between Gjedser and Darsserort. 
The Baltic round Mgen. Bm. To a line from the north end of Rügen 
northward. 
The Baltic round Bornholm. Bb. The waters surrounding Bornholm. 
Remarks on the dredging localities. 
I have considered it useful to make a list of all the localities where I have 
dredged and to give information about the depth, the nature of the bottom and 
the vegetation at each. They are also indicated on the accompanying charts by 
signs, illustrating the vegetation. By means of this it will be possible in the fol- 
lowing to give a detailed account of the occurrence of the single species in the 
Danish waters without too great prolixity, and, by means of the list and the charts, 
to contribute perhaps to the characterization of the separate waters with regard to 
the vegetation, even if the dredging localities are not so near each other, that they 
can serve as base for a chart showing the distribution of the vegetation. To obtain 
this, much more numerous observations than I have been able to make are ne- 
cessary. The Danish waters are so complicated, and the nature of the bottom 
often so variable from place to place, that it is not possible, from the dredging at 
one place to draw conclusions as to the conditions at another close by. It may 
also be remembered, that the aim of my investigations was not so much to de- 
termine, to what extent the bottom was overgrown, as to study the distribution 
and the mode of occurrence of the single species. That is why I have usually 
preferred to dredge at places where I could expect the bottom to be overgrown. 
If the result has nevertheless been, that so great a number of the dredging lo- 
calities have proved to be without vegetation, the reason is, that a relatively large 
