ABSTRACT
Six Red Sea ascidians (Cnemidocarpa hemprichi, Cnemidocarpa margaritifera, Polycarpa mytiligera, Pyura gangelion, Microcosmus pupa and Halocynthia spinosa) are redescribed, from their type localities, and previous misinterpretations are corrected. The original description of Halocynthia spinosa was incorrect, and the type specimen is redescribed.