Occurrence (presence/absence) of Bryozoa on several substrates (Cystoseira, Posidonia and rocky cliff hard substrate) sampled at Calvi Bay (Corsica) in September 1982 and April 1983. The data were digitized by VLIZ from the original report: Janssen, C.R.; Thielemans, L.K.; Vermeulen, Y. (1983). Bryozoa van de Baai van Calvi (Corsica), in: FKFO Project 2.9007.82. Systematiek en ecologie van mariene organismen: verslag over het tweede werkingsjaar 1983. pp. 59-69.