This report summarises and discusses the results of surveys of habitats and communities from 90 previously unsurveyed or poorly described sites around Skomer Marine Reserve (SMR). Attention was given to sites deeper than 30 m below Chart Datum, and disturbed bedrock areas. Survey methods are described, including diving practice, recording and photographic techniques. Site locations, grid references and a site map are given, together with written site descriptions for each site (many of which include accompanying sketches). The habitat information collected is summarised with the aid of several maps. Included is an update of a map of habitat and community classification around Skomer, according to Hunnam (1976). This habitat information is also discussed. Communities present in broad habitat categories are described with the aid of diagrams and discussed. Species distributions and observations of interest are described and discussed. Following the analysis of results from the 1984 survey, a short section dealing with recommendations for future work is given. Records currently considered sensitive have been removed from this dataset.