52 
the Limfjord samples, and the Kattegat and Baltic samples. The procedure in 
this case was as follows. 
First the quantity of alcohol was measured, and the amount of dry matter 
it contained was determined by evaporation of 10—20 ccm. to dryness and weighing 
the residue. 
Then the animals were sorted out and the weight of each species was 
determined. This weight we call the alcohol-weight. The animals here were 
in fact soaked in alcohol. Then a series of determinations of the dry matter was 
made for the animals which dominated in the sample in question. As they were 
different animals which dominated in the different samples, I thus obtained a series 
of determinations for the dry matter of all the animals occurring, and these deter- 
minations were used to calculate the quantity of dry matter of the animals which 
occurred in smaller quantities in a definite Fe and the weight of the dry matter 
of which was not directly determined. 
The determinations of the dry matter were made in quite the same manner 
as described under 1. I may however more particularly mention the determination 
of the dry matter in Kclunmocardwium. The digestive organs were taken out, the 
gut cut open and its contents washed out. Then the shells were added after 
extraction of the calcareous substance with hydrochloric acid. The whole was then 
dried and weighed. 
Quantity of dry matter in percentage of the alcohol-weight was 
as follows: 
Solenep eler us eN ere 6.2 Aporrhais pes pelecani ......…. 6.0 
NG arti da ASER 3.0 Ehraciakpapyrace dene 10.0 
Mira truneata see ENES NERE 8.2 Venus o allin eee ere 5.1 
Cardumkfasclatum ser UNE fin Astartewarbamiee senere 2.2 
Card duller ere RE 2.4 dos fbore air treere eee 2.2 
FA braalb are re AFL SR er: 7.0 (ONS UGE SE ER RE der 
Miyatanen artarena ONE BG Corbis sibbae eee 2.4 
Bedaspemnulse 43 rer bå Eitorna essere ESTERE ba 
Må comakcalcarene eee eee 7.6 Al Gera bulle eee eee 13.4 
dome baltiede re RER 5% Binme ap ert eee EN 14.0 
Mod EN es 6.s Buccinum undatum …….:...…. eter 
Metra sub runestene eee 4.0 Chætopo dask 3 SEA ER DER 10.9 
SED EET EN 5.4 Manos wor m see rv 
May il see dus 2 GET ES eg As Åphroditer ES Serene 16.6 
Cyprmarslan diese eee 3.1 Bectinadd ss. sne 15.0 
mm aklosco mb eo 12.6 Bem ogar drum 1.02 
Bectemipesilutrae nt SEERE 5.3 Bchimnus os ESS MEDER 2.04 
Åse eN ØRE Ry: 5.4 Diastylis særk STE Fee 1.6 
Opiioglypha sets er ERE 3.8 Cynthia: 593-050 SE SENERE 10. 
Psolusyst kt 253345 407 Aon SØRRE 21.9 OtheriHolothuranssen mene og 
In order to determine how many samples of the bottom-sampler are 
necessary in a water, to obtain an approximately correct representation of the 
animal life, the experiment was several times made im Thisted Bredning of 
