Imprint date 1886, but treated as 1887 in Hartman bibliography & catalogue, perhaps arising from a mistake in Ditlevsen 1917:39 (Ingolf) who uses 1886 in one place and 1887 in another. There is no evidence from elsewhere that publication was not until 1887. The name is not in Zoological Record for the relevant years.
Levinsen, G. M. R. (1886). Kara-Havets Ledorme (Annulata). [Book section]. 288-303. plate 25. IN: Lütken, C. F. (Ed.). Djimphna-Togtets Zoologiske-botaniske Udbytte. J. Hagerup. Köbenhaven.