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Show 1879. ] ON ARACHNIDA FROM THE MASCARENE ISLANDS. 729 HELIX (EURYCRATERA) IBARAOENSIS, n. sp. (Plate LVII. figs. 3, 4.) Shell imperforate, globosely ovate, moderately solid, shining, irregularly rugosely striated in front and very finely granu- LI!* A U the !*PPer whorIs> the granules descending to the base behind, yellowish olive, encircled with numerous narrow dark brown bands that lose themselves and become darker towards the aperture and base; spire flatly convex, apex depressed; whorls 3|, rapidly increasing, the last very large and inflated ; aperture oblique, large, roundly ovate, pearly bluish violet within ; peristome slightly thickened, the margins united by a thick callus; columella smooth. Diam. maj. 3 poll. 6 lin., min. 2 poll. 8 lin., alt. 2 poll. 4 lin. Hab. S.E. Betsileo, Madagascar. This fine shell somewhat approaches H. magnifica, Fer., but is much more globular and compact, with the position of the spire less remote ; and it has also a different style of coloration. Examples of this and the preceding species have lately been received from S.E. Betsileo, Madagascar, by M r . Edward Bartlett, of Maidstone, who has kindly placed them in m y hands for description. EXPLANATION OF PLATE LVII. Figs. 1, 2. Helix (Eurycratera) betsileoensis, p. 728. 3, 4. ( ) ibaraoensis, p. 729. 4. O n Arachnida from the Mascarene Islands and Madagascar. By A R T H U R G. B U T L E R , F.L.S. & c , Assistant Keeper, Zoological Department, British Museum. [Received November 1, 1879.] (Plate LVIII.) Last year a small series of Spiders was obtained through Mr. H. H. Slater from Reunion and Mauritius, of which the following is a list. 1. SCYTODES MAJOR, Simon. Plaine des Palmistes, Reunion. 2. ULOBORUS BORBONICUS, Vinson. Mauritius. 3. OLIOS LEUCOSIUS, Walckenaer. Mauritius. The identification of these three species, however, is a little doubtful, owing to the imperfection of the figures in Vinson's ' Araneides des iles de la Reunion ' &c. 47* |