@inbook{Porifera:SourceID:9104, author = {Reiswig, H.M.}, note = {The PDF supplied here is a proof - NOT the definitive printed text - of a chapter of the Systema Porifera}, title = {Order Hexactinosida Schrammen, 1903. pp. 1281. In: Hooper, J.N.A. & van Soest, R.W.M. (ed.) Systema Porifera. A guide to the classification of sponges (2 volumes). Kluwer Academic/ Plenum, NY 1708 + xvliii. ISBN 0-306-47260-0 (printed version).}, url = {https://marinespecies.org/porifera/porifera.php?p=sourcedetails&id=9104}, year = {2002} }