56 
of the fjords give a much greater mass of small animals and less of 
the large. ; 
From this there are exceptions, however, especially in the almost enclosed 
fjords. I may mention, for example, that Mya arenaria is quite predominant at 
certain places in Roskilde Fjord off Roskilde (see Table VI), that Scrobicularia 
plana is the same in the northern narrow part of Roskilde Fjord (see Table VI), 
but I have not found anything similar in the true Isefjord or inside Ourø (see 
Table VI). 
In certain parts of the Limfjord a few large Lamellibranchs also predo- 
minate, thus Mya truncata in Thisted Bredning (see Table V); the same applies 
to certain, especially easterly parts of Livø Bredning and Skive Fjord (see Table V), 
and lastly, both Mya truncata and Mya arenaria appear at places in great quantity 
in the innermost part of Louns Bredning. But at most of these places in the 
Limfjord there also occur a quantity of small animals, and in the regions 
between Nykøbing and Oddesund the latter dominate. I shall return to this subject 
in a later section. 
Tables V and VI show how little the whole group of Crustacea is of 
importance, both in number and weight, everywhere at the places investigated, 
and yet I cannot believe that the smaller Crustacea could escape the bottom-sampler; 
it is rather due to the fact, that so few samples were taken in the plant region. 
On the other hand the groups of worms are richly represented in both respects; 
Aphrodite and Pectinaria are very abundant, and also a number of other Chæto- 
pods, which however I have not yet determined to their species. 
At one place only, in Nissum Bredning, a Holothurian (Ascrdrella aspersa) 
is found in large quantities, larger in autumn than in spring; but they are so 
numerous here in the autumn, that trawling along the bottom is almost made 
impossible by them. 
Even Amphioxus lanceolatus has been taken with the bottom-sampler in 
the Kattegat (see Table VI), 5 specimens in all; but otherwise none of the higher 
animals. The Tables will show, however, what has been taken and what is wanting 
in these collections. I may just mention one more thing, the large quantity of 
Astarte warhami, A. borealis and Å. sulcata at Sprogø; their rough weight is greater 
than the half part of all the animals found. In earlier works I have drawn atten- 
tion to the occurrence of these characteristie Molluses far into our waters; hut I 
did not know that their quantity was so enormous. 
It is evident, that except for the Limfjord we have as yet far too few 
investigations of this kind, to be able to estimate the mass of the single species 
in the waters investigated as a whole; and even in the Limfjord it is only in 
Thisted and Nissum, and perhaps in Kaas Bredninger, that such can be done — 
for some of the species; but even if this must be done with'a certain reservation, 
as the plant belts have not yet been investigated, yet several conclusions may be 
drawn from the numbers found regarding the relative proportions of the different 
species; see further a later section. 
The Plates III— VI have been drawn to depict the sea-bottom in various 
waters; to these and their explanation reference may be made here. 
