Since the publication by the palæontographical Society of the third part of my monograph of the ‘Eocene Mollusca’, containing descriptions of the several Eocene species of Cypræa then known, I have obtained from the beds in the New Forest, foeming parts of the Bracklesham Bay series, several additional species; and Mr. Wetherell has also been so fortunate as to obtain another remarkably fine species from the cutting lately made near Highgate for the Highgate and Edgeware Railway. I now forward descriptions of these new Cyprœœ for publication in ‘The Geological Magazine;’ and I avail myself of the same opportunity to correct an error committed by me in the same part of my monograph, in referring to Marginella pusilla, a species described by me from High Cliff, a small Marginella from Headon Hill, which I now propose to seperate under the specific name œstuarina.