Aphrodita annulata Pennant, 1777 (original description)
Aphrodita lepidota minuta Pennant, 1777 accepted as Harmothoe imbricata (Linnaeus, 1767) (original description)
Aphrodita pedunculata Pennant, 1777 accepted as Lepidonotus squamatus (Linnaeus, 1758) (original description)
Asterias bifida Pennant, 1777 accepted as Antedon bifida (Pennant, 1777) (original description)
Asterias clathrata Pennant, 1777 accepted as Asterias rubens Linnaeus, 1758 (original description)
Asterias gibbosa Pennant, 1777 accepted as Asterina gibbosa (Pennant, 1777) (original description)
Asterias helianthemoides Pennant, 1777 accepted as Crossaster papposus (Linnaeus, 1767) (original description)
Asterias hispida Pennant, 1777 accepted as Leptasterias (Leptasterias) muelleri celtica A.M. Clark in Clark & Downey, 1992 (original description)
Asterias irregularis Pennant, 1777 accepted as Astropecten irregularis irregularis (Pennant, 1777) (original description)
Asterias oculata Pennant, 1777 accepted as Henricia oculata (Pennant, 1777) (original description)
Asterias pentaphylla Pennant, 1777 accepted as Ophiothrix fragilis (Abildgaard in O.F. Müller, 1789) (original description)
Asterias placenta Pennant, 1777 accepted as Anseropoda placenta (Pennant, 1777) (original description)
Asterias spinosa Pennant, 1777 accepted as Marthasterias glacialis (Linnaeus, 1758) (original description)
Astropecten irregularis (Pennant, 1777) (original description)
Buccinum minutum Pennant, 1777 accepted as Nassarius incrassatus (Strøm, 1768) accepted as Tritia incrassata (Strøm, 1768) (original description)
Bulla cylindracea Pennant, 1777 accepted as Cylichna cylindracea (Pennant, 1777) (original description)
Bulla patula Pennant, 1777 accepted as Xandarovula patula (Pennant, 1777) accepted as Simnia patula (Pennant, 1777) (original description)
Chiton crinitus Pennant, 1777 accepted as Acanthochitona crinita crinita (Pennant, 1777) accepted as Acanthochitona crinita (Pennant, 1777) (original description)
Chiton laevis Pennant, 1777 sensu Montagu, 1803 accepted as Callochiton septemvalvis (Montagu, 1803) (original description)
Chiton marginatus Pennant, 1777 accepted as Lepidochitona (Lepidochitona) cinerea (Linnaeus, 1767) represented as Lepidochitona cinerea (Linnaeus, 1767) (original description)
Echinus cordatus Pennant, 1777 accepted as Echinocardium cordatum (Pennant, 1777) (original description)
Jujubinus exasperatus (Pennant, 1777) (original description)
Murex acuminatus Pennant, 1777 accepted as Bittium reticulatum (da Costa, 1778) (original description)
Murex carinatus Pennant, 1777 accepted as Neptunea despecta (Linnaeus, 1758) (original description)
Murex costatus Pennant, 1777 accepted as Mangelia costata (Pennant, 1777) (original description)
Mya dubia Pennant, 1777 accepted as Rocellaria dubia (Pennant, 1777) (original description)
Mytilus curtus Pennant, 1777 accepted as Modiolus modiolus (Linnaeus, 1758) (original description)
Mytilus incurvatus Pennant, 1777 accepted as Modiolus barbatus (Linnaeus, 1758) (original description)
Mytilus pellucidus Pennant, 1777 accepted as Mytilus edulis Linnaeus, 1758 (original description)
Mytilus umbilicatus Pennant, 1777 accepted as Modiolus modiolus (Linnaeus, 1758) (original description)
Patella depressa Pennant, 1777 (original description)
Patella intorta Pennant, 1777 accepted as Ansates pellucida (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758 (original description)
Patella laevis Pennant, 1777 accepted as Patella pellucida Linnaeus, 1758 (original description)
Pecten laevis Pennant, 1777 accepted as Palliolum tigerinum (O. F. Müller, 1776) (original description)
Pecten obsoletus Pennant, 1777 accepted as Palliolum tigerinum (O. F. Müller, 1776) (original description)
Pholas parva Pennant, 1777 accepted as Barnea parva (Pennant, 1777) (original description)
Pinna fragilis Pennant, 1777 accepted as Atrina fragilis (Pennant, 1777) (original description)
Pinna ingens Pennant, 1777 accepted as Atrina fragilis (Pennant, 1777) (original description)
Sabella tubiformis Pennant, 1777 accepted as Lagis koreni Malmgren, 1866 (original description)
Solen pellucidus Pennant, 1777 accepted as Phaxas pellucidus (Pennant, 1777) (original description)
Tellina carnaria Pennant, 1777 accepted as Limecola balthica (Linnaeus, 1758) (original description)
Tellina cornubiensis Pennant, 1777 accepted as Irus irus (Linnaeus, 1758) (original description)
Tellina crassa Pennant, 1777 accepted as Arcopagia crassa (Pennant, 1777) (original description)
Tellina depressa Pennant, 1777 accepted as Gari depressa (Pennant, 1777) (original description)
Tellina trifasciata Pennant, 1777 accepted as Tellina donacina Linnaeus, 1758 represented as Moerella donacina (Linnaeus, 1758) (original description)
Trochus exasperatus Pennant, 1777 accepted as Jujubinus exasperatus (Pennant, 1777) (original description)
Turbo laevis Pennant, 1777 accepted as Eulima glabra (da Costa, 1778) (original description)
Turbo ulvae Pennant, 1777 accepted as Peringia ulvae (Pennant, 1777) (original description)
Turritella communis Risso, 1826 accepted as Turritellinella tricarinata (Brocchi, 1814) (misapplication)
Venus ovata Pennant, 1777 accepted as Timoclea ovata (Pennant, 1777) (original description)
Venus rhomboides Pennant, 1777 accepted as Polititapes rhomboides (Pennant, 1777) (original description)
Venus undata Pennant, 1777 accepted as Mysia undata (Pennant, 1777) (original description)

English great-clawed crab [from synonym] for Cancer platycheles Pennant, 1777