Very little is known of the early history of the non-marine Gastropoda; hence the discovery in the coal-bearing strata of Scremerston (Northumberland) of a small species closely resembling certain modern fluviatile operculate shells is of considerable interest. My thanks are due to Mr. J. Pringle for bringing the specimens in question to my notice; to Mr. R. G. Carruthers, to whom their discovery is due, for sending me particulars; and to Dr. F. L. Kitchin for permission to borrow them from the Museum of Practical Geology, where they are deposited.