Folin, L. de. 1880. On the Mollusca of H.M.S. 'Challenger' Expedition.--The Caecidae, comprising the genera Parastrophia, Watsonia, and Caecum. Proceedings of the Zoological Society of London 1879 806-812. [Stated date: -- --- 1879; true date: -- Apr 1880.] {Included species}
