Outline of archaeological analyses of shell middens; fieldwork among Gidjingali in Arnhem Land; ethnotaxonomny of shells collected along sea shore; methods of collection and cooking; calculations on quantities collected and nutritional value; division of labour in food collection; role of shell fish on total economy, comparison with animal hunting and plant collecting; effects of access to western foods and changes in diet; comparative data and interpretation of archaeological midden mounds in this area and elsewhere; submission to Northern Territory Land Council on attitudes to land and mineral exploration among Gigjingali; analysis of colour classification among Gidjingali and use of ochre.