A. E.  Verrill, ?Report on the cephalopods of the northeastern coast of America?, 1882.

J. E.  Gray, Catalogue of the Mollusca in the collection of the British Museum, 2, vol. 4. London: British Museum, E. Newman, 1850, p. 45.

J.  Meisenheimer, ?Pteropoda?, Tiefsee Exp. 1898-1899, vol. 4, p. 314, 1905.