Cook, 1964 - Polyzoa from West Africa. 1. Notes on the Steganoporellidae, Thalamoporellidae, and Onychocellidae. Resultats Scientifiques des Campagnes de la 'Calypso' (Annales institute Océanographique), 41 (Fasc.VI): 43-78. Caution: this file is over 7 Mbytes, and will take considerable time to download. (This is a link to a PDF file)