327 
separately, it will be seen that only very few species have been taken 
at each station, generally one, two, or maximally three. On the other 
hånd, the same list shows from the stations of the eastern part of the 
Kattegat quite another amount. Thus the station 3014 has nineteen 
different species, st. 3045 has twelve, st. 3047 eighteen species, 
st. 3049 ten species. As reason for the species-poverty of the Baltic 
I think that everybody will refer to the low salinity of this water; 
but it does not seem that the amount of species is elsewhere in- 
creasing proportionally with the increasing of the salinity, at any 
rate not when considering a rather constricted region. The locali- 
ties from where “Dana“ has made its richest harvest of Polychæta 
are neither regions of the North Sea nor the Skagerrack but de- 
cidedly the above named stations of the eastern part of the Katte¬ 
gat, localities as ^‘Groves Flak\ Fladen\ and other localities of 
that neighbourhood. Several of these stations present an amount 
of species exceeding the species-amount of the whole Baltic. Cer- 
tainly there are stations of the eastern part of the Kattegat which 
have only contributed with a few species to the “Dana“-material, 
but, in this connection, it is a faet of no importance as factors not 
given in the list may have asserted themselves. The main point 
in this connection is that from certain regions viz. the Baltic, all 
the stations have a low amount of species, while in other regions 
several stations prove to have a high amount. 
For the moment it is not easy to say for which reason the 
Eastern part of the Kattegat presents such an abundance of species 
as is presumably never met with in other marine districts of sim- 
ilar extent in Danish waters; I shall only point out, in this 
connection, that here a number of species oceur which are not 
found elsewhere in Danish waters within the Scaw, but which 
oceur partly in the North Sea or the Skagerrack and partly in 
the “Skargård“ of Sweden. Of such forms I shall here name 
Nephthys rubella, Nephthys paradoxa, Aonides oxycephala, Pectinaria 
pusilla, presumably also Euchone rubroeineta j a species, mentioned 
by Petersen (76) as characteristic for this area is also Eumenia 
crassa, which is, at any rate, going more southward in the Sound, 
where it is to be found until the Isle of “Hveen . 
I am fully aware that in this connection it is necessary to take 
into consideration the implements which have been used for fish- 
ing, but as to the “Dana“, on the eruises here dealt with, the trawl 
was almost exelusively employed excepting on behalf of some sta¬ 
tions in the Baltic where Petersen’s bottom-sampler was used. 
