Vortenia

Worthenia is a genus of fossil sea snails; it is an extinct genus of marine gastropods known exclusively from fossil remains. This genus is mainly found in rocks formed during the Devonian to Triassic periods (416 million to 200 million years ago) from central areas of North America. Worthenia was named for paleontologist Henry Amos Worthen who lived from 1813 to 1888. The specimen in question has a turban-shaped shell in which a ridge is raised and follows the edge of the coils. There are small knots along the ridge, and the shell opening is oval and large.