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Show 518 LIEUT.-COL. H. H. GODWIN-AUSTEN ON N E W [June 14, Small species, with very minute or no columellar process or These should eventually be brought into a subgenus of their own. DIPLOMMATINA MUNIPURENSIS, n. sp. Loc. South of the Barak River, between the Mao villages and Munipur (Godwin-Austen). Shell dextral, elongately fusiform ; sculpture minute, close costulation ; colour very pale greenish grey ; spire symmetrical, sides slightly convex ; suture well impressed ; whorls 6|, sides convex ; constriction in front and immediately above the aperture; no columellar tooth, its position indicated by a slight sinuosity on the columellar margin ; aperture nearly circular, subvertical; peristome closely double, very slight in form, the inner does not spread much upward on the penultimate whorl. Size: maj. diam. 1*5; alt. axis 2#7 millim. From the number of specimens found, this appears a very abundant species ; I never got anything like it in the Khasi Hills to the west. DIPLOMMATINA VENUSTULA, n. sp. Loc. Japvo Peak, Anghami Naga Hills (Godwin-Austen). Shell dextral, elongately fusiform, thin ; sculpture, fine, regular, close costulation throughout; colour pale amber ; spire high, sides flattish, apex acuminate; suture impressed; whorls 7\, sides convex, the penultimate the largest; constriction in front above the aperture ; aperture widely ovate, suboblique; peristome but slightly developed, narrowly double, expanded into a small wing on the upper and outer margin, giving it a very sinuated margin ; no columellar tooth. Size: maj. diam. 2'I ; alt. axis 4*0 millim. This species, of which I only obtained 3 specimens, is quite distinct, as shown in the form of the spire and particularly the expanded side of the peristome, which is an unusual character. DIPLOMMATINA DOMUNCULA, n. sp. Loc. Margarita, Naga Hills (TV. Doherty, in coll. T. H. Aldrich). Shell dextral, fusiform ; sculpture, strong, regular, distant costulation on all the whorls, much closer near the constriction, first two whorls smooth ; colour pale whitish with an ochraceous tint; spire with convex sides, apex blunt; suture well impressed ; whorls 7\, sides convex, antepenultimate the largest, last whorl does not rise upon the penultimate ; constriction above the aperture ; aperture circular, subvertical, curvilinear as seen from the side ; peristome double, not very much thickened; columellar tooth very minute, internal. Size : maj. diam. 1-3 ; alt. axis 3'0 millim. This is a very distinct form, quite new to me, and belonging to a group which is not represented, so far as I know, in the Khasi and Jaintia Hills. |