Amphoriscus oviparus (Haeckel, 1872) (additional source)
Bubaris verticillata (Bowerbank, 1866) accepted as Halicnemia verticillata (Bowerbank, 1866) (new combination reference)
Cliona terebrans (Duvernoy, 1840) accepted as Cliona celata Grant, 1826 (additional source)
Esperella littoralis Topsent, 1891 accepted as Mycale (Carmia) minima (Waller, 1880) (original description)
Esperiopsis edwardii (Bowerbank, 1866) accepted as Amphilectus fucorum (Esper, 1794) (new combination reference)
Halichondria inops Topsent, 1891 represented as Batzella inops (Topsent, 1891) (original description)
Hymeraphia coronula Bowerbank, 1874 accepted as Eurypon coronula (Bowerbank, 1874) (additional source)
Hymeraphia lacazei Topsent, 1891 accepted as Eurypon lacazei (Topsent, 1891) (original description)
Leucosolenia falcata (Haeckel, 1870) accepted as Ascandra falcata Haeckel, 1872 (new combination reference)
Leucosolenia pinus (Haeckel, 1872) accepted as Leucosolenia complicata (Montagu, 1814) (new combination reference)
Microciona dives Topsent, 1891 accepted as Phorbas dives (Topsent, 1891) (original description)
Myxilla (Pocillon) Topsent, 1891 accepted as Iophon Gray, 1867 (original description)
Myxilla (Pocillon) implicita (Bowerbank, 1882) accepted as Iophon hyndmani (Bowerbank, 1858) (new combination reference)
Plocamia microcionides (Carter, 1876) accepted as Plocamionida microcionides (Carter, 1876) (additional source)
Pocillon Topsent, 1891 accepted as Iophon Gray, 1867 (original description)
Reniera indistincta (Bowerbank, 1866) accepted as Haliclona (Rhizoniera) indistincta (Bowerbank, 1866) (new combination reference)
Stylinos Topsent, 1891 accepted as Hymeniacidon Bowerbank, 1858 (original description)
Stylinos uniformis (Bowerbank, 1866) accepted as Hymeniacidon perlevis (Montagu, 1814) (source of synonymy)
Stylotella columella (Bowerbank, 1874) accepted as Hemimycale columella (Bowerbank, 1874) (new combination reference)
Stylotella uniformis (Bowerbank, 1866) accepted as Hymeniacidon perlevis (Montagu, 1814) (new combination reference)

Celtic Seas for Bubaris verticillata (Bowerbank, 1866) 
Celtic Seas for Esperella littoralis Topsent, 1891 
Celtic Seas for Esperiopsis edwardii (Bowerbank, 1866) 
Celtic Seas for Halichondria inops Topsent, 1891 
Celtic Seas for Hymeraphia coronula Bowerbank, 1874 
Celtic Seas for Hymeraphia lacazei Topsent, 1891 
Celtic Seas for Leucosolenia falcata (Haeckel, 1870) 
Celtic Seas for Leucosolenia pinus (Haeckel, 1872) 
Celtic Seas for Microciona dives Topsent, 1891 
Celtic Seas for Myxilla (Pocillon) implicita (Bowerbank, 1882) 
Celtic Seas for Plocamia microcionides (Carter, 1876)  (inaccurate)
Celtic Seas for Reniera indistincta (Bowerbank, 1866) 
Celtic Seas for Stylinos uniformis (Bowerbank, 1866) 
Celtic Seas for Stylotella columella (Bowerbank, 1874)