Article: Some North American species of the Devonian tetracoral Smithiphyllum

The tetracoral genus Smithiphyllum is emended. It is shown to be closely related to Tabulophyllum and consequently is transferred from the Spongophyllidae to the Endophyllidae.Additional material of the type species, S. imperfectum (Smith), is described and three new Frasnian species, S. belanskii from Iowa, S. kindlei from Alberta, and S. whittakeri from the Northwest Territories, are erected.