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Show 330 DR. O. F. VON MOELLENDORFF ON [June 2, The Secretary exhibited on behalf of Mr. F. E. Blaauw, C.M.Z.S., specimens of some Long-tailed Tits shot by him last year in Holland and belonging to the museum of the Royal Zoological Society " Natura Artis Magistra." They had been sent to this country for the purpose of ascertaining whether they belonged to the British form Acredula rosea or the white-headed Continental form A. cau-data (see Dresser's 'Birds of Europe,' vol. iii. pp. 63-67). There could be no doubt that these birds belonged rather to the British form with striped head ; but Mr. Blaauw'stated that the white-headed form was also met with in Holland, and that he had occasionally observed examples of the two forms paired together. Mr. Frank Finn, B.A., exhibited a male hybrid between the Chilian Pintail (Dafila spinicauda) 6 and Summer Duck (Mx sponsa) 2 > bred in the Gardens, and pointed out that it differed from both parents, though it was to a certain extent intermediate. The following papers were read:- 1. On the Land and Freshwater Shells of Perak. By O. F. von MOELLENDORFF, Ph.D. [Received April 15, 1891.] (Plate XXX.) Since the publication of my paper on the Land-Shells of Perak (Journ. As. Soc. Beng. Iv. pt. ii. no. 4, 1886), Dr. R. Hungerford bas been kind enough to supply m e with some more materials from that hitherto very imperfectly known region. Mr. J. de Morgan, who collected in Perak in 1884, published descriptions of some new species in ' Le Naturaliste ' (vii. 1885, no. 9, pp. 68-70), and gave a more extensive memoir on the conchological fauna of the Malacca peninsula in the Bulletin Soc. Zool. de France (x., 1885), with figures of his novelties. This latter work I did not know of when I wrote the above-mentioned paper, and the study of it uow enables me to rectify some of m y former classifications, and at the same time to correct a number of errors contained in de Morgan's work. I think it therefore advisable to give now a revised catalogue of all the Land and Freshwater Shells at present known from Perak, with descriptions of some further new species. Fam. STREPTAXIDJE. 1. STREPTAXIS PLUSSENSIS, de Morgan. Streptaxis plussensis, de Morgan, Le Nat. 1885, p. 68; Bull. Soc. Zool. Fr. x. 1885, p. 23, t. i. fig. 1. Mt. Tchehel, Pluss valley (de Morgan). A good new species, somewhat related to 5. lemyrei, Morel., from Cambodia. Dr. Hungerford obtained at Bukit Pondong a few specimens o |