MolluscaBase taxon details
original description
(of Unio distortus W. Bean, 1836 †) Bean, W. (1836). Description and Figures of <em>Unio distortus</em> Bean, and <em>Cypris concentrica</em> Bean, from the Upper Sandstone and Shale of Scarborough; and <em>Cypris arcuata</em> Bean, from the Coal Formation of Newcastle. <em>The magazine of natural history and journal of zoology, botany, mineralogy, geology and meteorology.</em> 9: 376-377., available online at https://www.biodiversitylibrary.org/page/2293321
page(s): 376, textfig. 53 [details]
original description
(of Pachyodon vetustus T. Brown, 1843 †) Brown, T. (1843). Description of some New Species of the Genus <em>Pachyodon</em>. <em>The Annals and Magazine of Natural History.</em> 12(79): 390-396., available online at https://www.biodiversitylibrary.org/page/2237918
page(s): 395, pl. 16*, fig. 7 [details]