In a series of NATO subsidized publications, under contract RG 001/88, scientists from various NATO countries (D, F, NL, SP, UK, and USA) have executed comparative studies on the aquatic biotas, in particular the stygofauna, of various mid-Atlantic islands: Madeira, Canary Islands, Cape Verde Islands, and Ascension. We were fortunate enough to receive NATO support again (under reference CRG 940976) for a follow-up study on another island in the central Atlantic, St. Helena.