Alder, J.; Hancock, A. (1843). Notice on a British species of <em>Calliopaea</em> d'Orbigny and on four new species of <em>Eolis</em> with observations on the development and structure of the nudibranchiate mollusca. <em>Annals and Magazine of Natural History.</em> 12: 233-236., available online athttp://biodiversitylibrary.org/page/22101138[details]
original descriptionAlder, J.; Hancock, A. (1843). Notice on a British species of <em>Calliopaea</em> d'Orbigny and on four new species of <em>Eolis</em> with observations on the development and structure of the nudibranchiate mollusca. <em>Annals and Magazine of Natural History.</em> 12: 233-236., available online athttp://biodiversitylibrary.org/page/22101138[details]