Calcispongia accepted as Calcarea (original description)
Duseideia Johnston, 1842 accepted as Dysidea Johnston, 1842 (original description)
Duseideia papillosa Johnston, 1842 accepted as Epizoanthus papillosus Johnston, 1842 (original description)
Dysidea Johnston, 1842 (original description)
Dysidea papillosa (Johnston, 1842) accepted as Epizoanthus papillosus Johnston, 1842 (original description)
Esperia aegagropila (Johnston, 1842) accepted as Mycale (Aegogropila) contarenii (Lieberkühn, 1859) (original description)
Geodia zetlandica Johnston, 1842 accepted as Geodia cydonium (Linnaeus, 1767) (original description)
Grantia ciliata (Fabricius, 1780) accepted as Sycon ciliatum (Fabricius, 1780) (additional source)
Grantia fistulosa Johnston, 1842 accepted as Leucandra fistulosa (Johnston, 1842) (original description)
Grantia lacunosa Johnston, 1842 accepted as Clathrina lacunosa (Johnston, 1842) (original description)
Grantia multicavata Bean in Johnston, 1842 accepted as Clathrina coriacea (Montagu, 1814) (original description)
Grantia pulverulenta (Grant, 1826) accepted as Leucandra ananas (Montagu, 1814) (new combination reference)
Halichondria aculeata Johnston, 1842 accepted as Raspaciona aculeata (Johnston, 1842) (original description)
Halichondria aegagropila Johnston, 1842 represented as Mycale (Aegogropila) contarenii (Lieberkühn, 1859) (original description)
Halichondria albescens sensu Johnston, 1842 (original description)
Halichondria carnosa Johnston, 1842 represented as Suberites carnosus (Johnston, 1842) (original description)
Halichondria celata (Grant, 1826) represented as Cliona celata Grant, 1826 (new combination reference)
Halichondria cervicornis Johnston, 1842 represented as Haliclona (Haliclona) oculata (Linnaeus, 1759) (original description)
Halichondria ficus Johnston, 1842 accepted as Suberites ficus (Johnston, 1842) (original description)
Halichondria fucorum (Esper, 1794) represented as Amphilectus fucorum (Esper, 1794) (source of synonymy)
Halichondria hirsuta Fleming, 1828 accepted as Suberites hirsutus (Fleming, 1828) (redescription)
Halichondria hystrix Johnston, 1842 represented as Cliona celata Grant, 1826 (original description)
Halichondria incrustans Johnston, 1842 represented as Myxilla (Myxilla) incrustans (Johnston, 1842) (original description)
Halichondria infundibuliformis (Linnaeus, 1759) represented as Axinella infundibuliformis (Linnaeus, 1759) (additional source)
Halichondria johnstonia Bowerbank in Johnston, 1842 represented as Pachymatisma johnstonia (Bowerbank in Johnston, 1842) (original description)
Halichondria maculans Johnston, 1842 represented as Suberites maculans (Johnston, 1842) (original description)
Halichondria oculata (Linnaeus, 1759) represented as Haliclona (Haliclona) oculata (Linnaeus, 1759) (new combination reference)
Halichondria palmata (Ellis & Solander, 1786) represented as Isodictya palmata (Ellis & Solander, 1786) (new combination reference)
Halichondria papillaris (Linnaeus, 1791) represented as Halichondria (Halichondria) panicea (Pallas, 1766) (new combination reference)
Halichondria plumosa (Montagu, 1814) accepted as Phorbas plumosus (Montagu, 1814) (new combination reference)
Halichondria saburrata Johnston, 1842 accepted as Myxilla (Myxilla) incrustans (Johnston, 1842) (original description)
Halichondria seriata sensu Johnston, 1842 represented as Ophlitaspongia papilla Bowerbank, 1866 (original description)
Halichondria sevosa Johnston, 1842 represented as Halichondria (Halichondria) panicea (Pallas, 1766) (original description)
Halichondria simulans Johnston, 1842 represented as Haliclona (Haliclona) simulans (Johnston, 1842) (original description)
Halichondria suberea represented as Suberites suberia (Montagu, 1814) (basis of record)
Halichondria ventilabrum (Linnaeus, 1767) accepted as Phakellia ventilabrum (Linnaeus, 1767) (new combination reference)
Halichondria virgultosa Johnston, 1842 represented as Suberites virgultosus (Johnston, 1842) (original description)
Halisarca Johnston, 1842 (original description)
Halisarca dujardinii Johnston, 1842 (original description)
Pachymatisma Bowerbank in Johnston, 1842 (original description)
Suberites maculans (Johnston, 1842) (original description)
Tethea Johnston, 1842 accepted as Tethya Lamarck, 1815 (original description)

Celtic Seas for Grantia fistulosa Johnston, 1842 
Celtic Seas for Grantia pulverulenta (Grant, 1826) 
Celtic Seas for Halichondria aegagropila Johnston, 1842 
Celtic Seas for Halichondria carnosa Johnston, 1842 
Celtic Seas for Halichondria johnstonia Bowerbank in Johnston, 1842 
Celtic Seas for Halichondria maculans Johnston, 1842 
Celtic Seas for Halichondria saburrata Johnston, 1842 
Celtic Seas for Halichondria seriata sensu Johnston, 1842 
Celtic Seas for Suberites maculans (Johnston, 1842) 
North Sea for Grantia lacunosa Johnston, 1842 
North Sea for Halichondria aculeata Johnston, 1842 
North Sea for Halichondria ficus Johnston, 1842 
North Sea for Halichondria fucorum (Esper, 1794) 
North Sea for Halichondria incrustans Johnston, 1842 
North Sea for Halichondria palmata (Ellis & Solander, 1786) 
North Sea for Halichondria simulans Johnston, 1842 
North Sea for Halichondria virgultosa Johnston, 1842 
North Sea for Halisarca dujardinii Johnston, 1842 
United Kingdom Exclusive Economic Zone for Halichondria maculans Johnston, 1842 
United Kingdom Exclusive Economic Zone for Suberites maculans (Johnston, 1842) 

Lectotype BMNH 1847.9.7.51, geounit North Sea, identified as Halichondria ficus Johnston, 1842
Unknown type BMNH BK 839, geounit Celtic Seas, identified as Halichondria johnstonia Bowerbank in Johnston, 1842

 Etymology

 for Pachymatisma Bowerbank in Johnston, 1842

From the greek ‘pachy-’ meaning ‘thick’ or ‘dense’ and ‘-matisma’ meaning ‘dressed’ or ... [details]

 Nomenclature

 for Duseideia Johnston, 1842

There can be little doubt that Johnston (1842) changed his mind on the spelling of this genus name after he had ... [details]