Synonymy was suggested by Arndt (1935), p.67. Previously, Lundbeck (1910), p. 116, stated that it 'seems to be ... an Eurypon', but that is unlikely to be the case as Bowerbank's description and figure clearly demonstrate the presence of isochelae, lacking from Eurypon.
Arndt, W. 1935. Porifera. <i>In</i>: Die Tierwelt der Nord- und Ostsee. 3a (27).(Leipzig): 1-140. Available for editors [request]