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260 plates, all drawn by the author, and colored by hand by his sister. In 1834 Conrad published New Fresh-water Shells of the United States, with Lithographic Illustrations and a Monograph of the Genus Anculotus of Say. Also, A Synopsis of the American Naiades; Philadelphia, Judah Dobson, 108 Chestnut Street, May 3, 1834. The full title of this little volume, with precise date of publication (not much larger than the title is long) is given, because even then questions of priority had arisen, and others laid claim to some of Conrad's species. This unhappy wrangling was kept up for many years. Prof. Dall refers to this, as we shall see further on, as “numerous controversies, which are now ancient history.” Conrad's own version should be given. He claimed that the editions of his publications were largely bought up and destroyed by a worker in the same field, and this explains the rarity of some of his writings. In the preface of the little volume above mentioned the author says: “While residing in the mansion of my kind and hospitable friend, Judge Tait, of Claiborne, Alabama, where I was employed in collecting the organic remains of the vicinity, I occasionally made excursions up and down the Alabama for the purpose of procuring fresh-water shells. I have succeeded in obtaining some species which I believe to be new, and hope to fix by accurate delineations and descriptions.” The result was the little book, which is dedicated to the late Charles A. Poulson, of Philadelphia, a prominent conchologist in his day, and one of Conrad's financial backers in his several expeditions south in search of both recent and fossil shells. In 1834, in the Journal (old series) of the Philadelphia Academy of Natural Sciences, Volume VII, Conrad published Observations on the Tertiary and More Recent Formations of a Portion of the United States, which appears to have been his first communication to that body. In 1841 the Proceedings of the Academy were commenced, and a new series of the Journal in quarto. In the former, from Volume I to Volume XXXVI, Conrad's contributions appear in every year; the articles varying from two to a dozen in number. In the first four volumes of the new journal he has eleven contributions, all of which are profusely illustrated. In 1836 Conrad published Monography of the Family Unionidæ, or Naiades of Lamarck (fresh-water bivalve shells), of North America. Illustrated by Figures drawn on Stone from Nature. Philadelphia: J. Dobson, 1836. This work, like the Marine Conchology, was never finished. It would seem as if the magnitude of the work had not occurred to him at the time, or that he was soon tired of any subject that he took up, but the real difficulty was a want of financial support. There were never enough subscribers to meet the expense of publication. At this time, too, his health was very bad, and he seemed to lose