Alder J. (1841). Observations on the genus <i>Polycera</i> with descriptions of two new British species. <i>Annals and Magazine of Natural History 6</i>: 337-342, pl. 9 [gennaio][details]
original descriptionAlder J. (1841). Observations on the genus <i>Polycera</i> with descriptions of two new British species. <i>Annals and Magazine of Natural History 6</i>: 337-342, pl. 9 [gennaio][details]