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Show 532 MR. P. L. SCLATER O N T H E [June 15, 6. MERGUS OCTOSETACEUS, Vieill. Brazilian Merganser. Mergus octosetaceus, Scl. et Salv. P. Z. S. 1876, p. 409. Hab. Interior of Brazil. Rare even in the best-stocked collections, and not known alive. K. CONCLUSIONS AS TO INTRODUCTION. It would appear, therefore, from the foregoing list (as will be seen more closely by the subjoined summary) that out of about 176 certainly known species of Anatidae, 94, or more than one half, have been at some time or other acquired in the living state, and shown in zoological gardens or other such places, and that of these 50 have propagated in captivity. Table I. Showing the numbers of introduced Anatidae. 2, Cereospinte 5. Anatinaj 6. FuligulinEe Known. 1 1 38 10 76 32 9 3 6 176 Species. Exhibited. 1 1 25 8 43 13 "3 94 Bred. 1 14 5 25 5 50 L. REMARKS ON T H E GEOGRAPHICAL DISTRIBUTION OF THE ANATIDAE. I will conclude with a few remarks upon the geographical distribution of the Anatidae. In treating of this part of the subject I find it impossible to separate conveniently the Palaearctic and Nearctic species. So many of the high northern species are circumpolar, or common to both continents, and so many other of the Palaearctic species have closely allied (in some cases barely separable) representatives in the Nearctic area, that it is much more natural to unite these categories into one group as "Arctic Anatidae." Adding to this the other four generally recognized divisions, we shall find the Anatidae come out somewhat as follows, in five great geographical groups :- |