The systematic collection of biological specimens from British caves began in the 1930s, and increased in scope through the 1940s and 1950s. The results appeared as supplements or records of the Cave Research Group of Great Britain between 1955 and 1965, covering the years 1938 to 1963. However, no index was produced for sitenames or taxonomic groups (or non-cave sites) located within this primary source. This index is intended to overcome that omission, and to explain some of the changes in nomenclature that have occurred in the intervening years.