Résumé : The structure and absolute configuration of 2‐desoxylemnacarnol (IV) and 2‐desoxy‐12‐oxolemnacarnol (V), two novel sesquiterpenes isolated from soft corals of the genera Lemnalia and Paralemnalia were established by chemical correlation with lemnacarnol [II]. Copyright © 1977 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim