Sowerby (2), G. B., 1846, Appendix to Part II: Description of the Tertiary fossils shells from South America, 605 - 648. In Darwin, C. (ed.), Geological Observations on the Volcanics Islands and Parts of South America Visited During the Voyage of H. M. S. ‘‘ Beagle "

Sowerby (2), G. B., 1846, Appendix to Part II: Description of the Tertiary fossils shells from South America, 605 - 648. In Darwin, C. (ed.), Geological Observations on the Volcanics Islands and Parts of South America Visited During the Voyage of H. M. S. ‘‘ Beagle ", Appleton