Mr. Edwards in his beautiful work (Eoc. Moll. p. 311, pl. 32, fig. 2) described a species of Pleurotoma under the title of Pl. turbida, Sol. He regards Pl. colon, Sow., as a synonym, but not Pl. colon, Sow., in Deshayes. In this I think he was mistaken. The species described by Deshayes appears to me different from the Pl. colon, Sow., and identical with the species figured by Solander under the name of Murex turbidus. In the second edition of his work Deshayes says that he “noted this species for mischief,” because it is not found at Soisson, but he retained the name of colon, Sow.