This dataset contains an inventory of the benthic fauna of the Gulf of Lion by bottom trawling. The objectives are not known. We assume that this is an exploratory seabed trawling survey to assess the fishing possibilities in the region with this type of gear. We know that the inventory was hand-written by Jacques Ancellin (director of the Boulogne-sur-Mer laboratory after the Second World War and he joined the OSTPM in 1942). Only species presence was recorded.