The black color described by Bowerbank as the species character is known to occur in freshly collected specimens of Hymeniacidon perlevis, see for example Ackers et al. (1992), p. 131. For that reason we assume this to be a junior synonym of that species.
Ackers, R.G.; Moss, D.; Picton, B.E. (1992). Sponges of the British Isles (‘Sponges V’). <em>A Colour Guide and Working Document. Marine Conservation Society.</em> 1-175.