Opisthobranch Gastropods from the type locality of the Stone City beds (Middle Eocene) of Texas

Stone City Bluff on the Brazos River in Burleson County, Texas, discovered in 1846 by Ferdinand Roemer, is the type locality of the Stone City beds, there 61.1 feet thick. Beneath the Stone City beds approximately 12 feet of Sparta sand and above them 24.2 feet of the Wheelock member of the Cook Mountain formation are exposed at "the bluff, of which a detailed section is given. These beds are of Middle Eocene age and belong to the Claiborne group. [...]