Published July 1844. "A description of new species of Mytilacea, Amphidesma and Odostomia" is the title as appears on the table of contents; the title in the paper itself appears as "A description of new species of Mytilacea, &c." p. 14 and "A description of new species of recent shells, chiefly from the collection of W Metcalfe, Esq." p. 17