title: The nudibranch names mentioned as n.sp. in Bergh (1861) are almost all nomina nuda (Gastropoda: Heterobranchia: Nudibranchia).
abstract: In a publication in Danish from 1861, Bergh described the nematocysts found in a number of nudibranch species. Many of the species had been described previously, but a number were new and given names, but without a description. These species are nomina nuda. We have translated the "descriptions", including the foot-notes, and reproduced the original plate to show that only the nematocysts (real or assumed) were described. The only species given a short description fulfilling the requirements of the ICZN is Pleurophyllidia quadrilateralis, which was described as the only species in the new genus Sancara. This in turn was shown to be a junior synonym of Linguella de Blainville, 1823. All the species were subsequently described anatomically in detail and made valid in a number of papers, and most of the type material is located in the Zoological Museum, Copenhagen (Natural History Museum of Denmark). The names in current use have been given.
authors.affiliation: Zoological Museum, The Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, SK-2100 Copenhagen, DENMARK.; Email: krjensen@snm.ku.dk.
authors.forename: Kathe
authors.initials: K
authors.lastname: Jensen
authors.affiliation: Zoological Museum, The Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, SK-2100 Copenhagen, DENMARK.; Email: cnielsen@snm.ku.dk.
authors.forename: Claus
authors.initials: C
authors.lastname: Nielsen
mesh_terms: D000818:Animals; D003718:Denmark; D049851:Gastropoda / Q000033:anatomy & histology* / Q000145:classification*; D049672:History, 19th Century; D011643:Publishing / Q000266:history*; D009626:Terminology as Topic