Individual size measurments made on fauna captured from Kajak gravity corer and van Veen grabs. Much of the sampling was conducted in conjunction with the Swedish Environmental Protection agencies annual benthic macrofauna survey. These samples formed the bulk of the doctoral thesis of Daniel Duplisea at the Department of Systems Ecology, Stockholm University in the mid 1990s. There are few replicates but a decent spatial coverage. Environmental data on bottom water temperature, salinity, oxygen, sediment C and N and loss of weight on ignition are included for many stations.