[3] Were it necessary at this time of day to point out the unnatural separation of shells intimately connected with each other, which the Linnæan arrangement presents, it would be sufficient to observe, that the genus Bulimus is formed of shells scattered in the old genera of Turbo, Helix, and Bulla: thus we see in Mr. Dillwyn's Catalogue, the large pink-mouthed African land-snail put in the same genus with our English Bulla lignaria, and aperta; the one inhabiting the depths of forests, and the others the depths of ocean!