Hooper 1984. Sigmaxinella soelae and Desmacella ithystela, two new desmacellid sponges (Porifera, Axinellida, Desmacellidae) from the northwest shelf of Western Australia, with a revision of the family Desmacellidae. Monograph Series of the Northern Territory Museum of Arts and Sciences, No. 2 1984: i-xi, 1-58