1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 297 SUPPLEMENTARY NOTES ON SOME SPECIES OF MOLLUSKS OF THE BERING SEA AND VICINITY. By \¥. H. DAIili. (With two plates.) In the American Journal of Conchology for 1871 (pp. 93-160, pi. 13-16) the writer described a number of species from Bering Sea and the adjacent Arctic region, a part of which were figured; and from 1871 to 1873 a number of additional .species were characterized, and some of them figured, in the Proceedings of the California Academy of Sciences. The working up of the whole northern collections obtained by the writer from 1865 to 1874, with additions made by himself in 1880, and by many others between 1874 and 1886,* has been an immense task, as yet only partially accomplished. Meanwhile the briefly characterized species have been referred to by several authors and not always defi-nitely understood. For this reason it has seemed well to add some additional notes and figures, without waiting for the complete presen-tation of the final report. In 1878 a series of the more critical species was taken by me to Europe and compared with typical specimens in the public museums of Bergen, Christiania, Stockholm, Goteborg, Copenhagen, Berlin, and London, together with specimens in the hands of Messrs. Friele, G. O. Sars, von Maltzan, Hanley, Jeffreys, Boog-Watson, Marshall, and other gentlemen interested in the Arctic fauna, to all of whom and to the gentlemen in charge of the official collections in the cities above men-tioned, especiallj' Professors Lov6n, von Martens, Liitken, E. A. Smith, and Steeustrup, my sincere and hearty thanks are due. Careful notes were made at the time of comx)arison, so it is evident that these speci-mens have a peculiarly typical and standard character after having been submitted to such expert criticism. The figures herewith are taken from those specimens; the specimens themselves, with many others, form part of the collection of the TJ. S. National Museum. The present article may be regarded as a first instalment, related to the two which precede it, but also having jirobable successors, as time permits the discussion of the material. Cancellaria ( Admete ?) middendorfSana Dall. Admete middendorffiana Dall. Proc. U. S. Nat. Mus., 1884, p. 524, Sept., 1884. In the above mentioned proceedings reference was made to a figure of Middendorfl:'(Mal. Ross., ii, pi. ix, figs. 13-14) of a shell from the Arctic part of Bering Sea, which I took to be intended to represent a species *Incliuliug the annual expeditions of the revenue cutters Corwin and Rush, the collections of Messrs. Fisher, of the U. S. Coast Survey; Turner, Stejneger, Murdoch, and others, of the Signal Service ; and of Stoney, Nichols, and other naval otiScers.
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