On my return to civilization, after an absence of nearly three years, I observe in the GeologicalMagazine for 1874, New Series, Decade II. Vol. I., pp. 404 and 433, a paper by Mr. R. J. L. Guppy, of Trinidad, describing new species of fossils from the West Indian Tertiaries, to which is appended a list of the fossils known to him up to that date. Unfortunately Mr. Guppy has overlooked my Memoir on the Geology af Santo Domingo, published in the Transactions of the American Philosophical Society more than a year before the date of his paper. In that paper I nearly doubled the list of known fossils in the West Indian Miocene, basing my determinations on a collection of unprecedented magnitude, made during the prosecution of the Geological Survey of the Dominican Republic.