[Anonymous]. "[Review of Specimen Days and Collect]." Westminster Review n.s. 64 (July 1883) 287-91 to "Call, Wathen Mark Wilks" as attributed in the Wellesley Index (DNB: Wathen Mark Wilks, 1817-1890, misc. author. Venn.) Note that Call also is credited with writing an 1860 review of Leaves of Grass.
Also, I have substituted "Metcalfe, William Musham" for "Anonymous" here: [Anonymous]. "Walt Whitman. "[Review of Leaves of Grass (1881–82), Specimen Days and Collect, and Poems of Walt Whitman]" Scottish Review (September 1883): 281-300. The Wellesley Index credits: Metcalfe, William Musham, 1840-1916, editor Scot Rev.Who Was Who, A Catalog of Books Represented by Library of Congress Printed Cards