Work found, with species-group names introduced therein:
Alder, J. and A. Hancock. 1851a. Descriptions of two new species of nudibranchiate Mollusca, one of them forming the type of a new genus. Annals and Magazine of Natural History (2)8 290-302, pls. 9-10. [Stated date: -- Oct 1851.] Oithona nobilis, see Fiona pinnata (Eschscholtz, 1831)