The hitherto undescribed sterol composition of three marine sponge species belonging to the genus #Cynachyrella$ are reported : #C. alloclada$ and #C. kukenthali$ from the Senegalese coast, at two different depths, and C. aff. #schultezei$ from the lagoon of Nouméa, New Caledonia. (D'après résumé d'auteur)