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Show 1877.] MR. G. F. ANGAS ON SHELLS FROM MADAGASCAR. 527 10. Notes on a small Collection of Land and Freshwater Shells from South-east Madagascar, with descriptions of new Species. By G E O R G E FRENCH ANGAS, C.M.Z.S., F.L.S., &c. [Eeceived June 2, 1877.] (Plate LIV.) Mr. Edward Bartlett has placed in m y hands for examination a small collection of land and fluviatile shells collected by Mr. Waters at Ekongo, on the south-east coast of Madagascar. It contains the following species :- Achatina acuta, Fer. Cyclostomus bicarinatus, Sow., Helix cornu-giganteum, Lam. and several varieties. farafanga, H. Ad. boivini, Pfr. souverbei, Fisch. tricarinatus, Lam. sepulchralis, Fer., and vars. multifasciatus, Grate. - omphaloides, Pfr. Melania amarula, Lam. calypso, Pfr. Melania, sp.? xystera, Valenc, and vars. Navicella lineata, Lam. devali, Petit. eximia. Megalostoma crocea. Lymncea natalensis, Krauss, large Cyclotus macareee, Petit. var. Nerita caffra, Wood. BULIMUS BALSTONI, n. sp. (Plate LIV. fig. 7i) Shell imperforate, elongately ovate, somewhat thin, shining, irregularly longitudinally striated, and crossed here and there with concentric lines, giving portions of the surface somewhat of a tessellated appearance, rich chestnut-brown, paler towards the apex; spire elongately conical, somewhat obtuse at the apex ; whorls 7, slightly convex, the last longer than the spire; sutures impressed, margined, and crenulated; aperture ovately oblong, bluish purple within ; outer lip slightly arcuate, and a little thickened at the edge ; inner lip with a strong callus, which is slightly flattened and expanded over the columella. Alt. 3 inches 9 lines, diam. 1 inch 4 lines; length of aperture 1 inch 6 lines, breadth 9 lines. Hab. Ekongo, S.E. coast of Madagascar. This fine Bulimus must not be confounded with B. clavator of Petit de la Saussaye, another Madagascar species. They are distinct in form, texture, and other characters. At the request of Mr. Edward Bartlett I have called this species after Mr. R. J. Balston. HELIX WATERSI, n. sp. (Plate LIV. figs. 3 a, 3 b.) Shell with a small compressed umbilicus, discoidal, rather solid; obliquely closely striated with irregular, somewhat undulating, erect strise, which are crossed by numerous concentric lines, exhibiting here and there a minutely reticulated appearance at the points of crossing, |