MolluscaBase taxon details
original description
(of Natica occidentalis J. Hall, 1845 †) Hall, J. (1845). Descriptions of organic remains collected by Captain J. C. Frémont, in the geographical survey of Oregon and North Californa. In: Frémont, J.C. Report of the exploring expedition to the Rocky Mountains in the year 1842, and to Oregon and North California. Gales and Seaton, Washington, pp. 304-310., available online at https://www.biodiversitylibrary.org/page/32560211
page(s): 308, pl. 3, figs 8-8a [details]
original description
(of Lithasia antiqua Gabb, 1866 †) Gabb, W. M. (1866-1869). Geological Survey of California. Palaeontology. Volume II. Cretaceous and Tertiary fossils. <em>Palaeontology. Volume II.</em> 1-38, pls. 1-13 [Feb 1866]; 39-299, pls. 14-36 [1869?]; i-xiv [1869]., available online at https://www.biodiversitylibrary.org/page/2066671
page(s): 13, pl. 2, fig. 22 [details]
additional source
Taylor, D. W. (1966). Summary of North American Blancan nonmarine mollusks. <em>Malacologia.</em> 4(1): 1-172, pls 1−8., available online at https://www.biodiversitylibrary.org/page/13147234
page(s): 73 [details]