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Show 514 LIEUT.-COL. H. H. GODWIN-AUSTEN ON NEW [June 14, DIPLOMMATINA THOMSONI, n. sp. Loc. South Burrail (Godwin-Austen). Shell dextral, elongately fusiform; sculpture, 3 apical whorls smooth, all the rest with very fine regular, rather close ribbing; colour whitish ; spire rather high, sides flattened ; apex rather blunt; suture moderately impressed; whorls 7\, sides convex, the antepenultimate the largest, last whorl ascending near the aperture ; constriction lies directly behind and adjacent to the peristome; aperture oval; columellar tooth small for size of shell and lying within the aperture ; peristome as usual. Size: maj. diam. 2-4 ; alt. axis 5-0 millim. I have named this species after Col. Mowbray Thomson, who, at the time it was collected, accompanied our camp in his capacity of Political Agent of Munipur, while the boundary of that State was being surveyed by me in 1872-73 ; in carrying out this work he rendered us great assistance, although much thwarted by the unfriendly action of the Munipur Durbar. In general form this shell is like D. pachycheilus, Bs., a Darjiling species, but the columellar tooth is never so large as in that species. DIPLOMMATINA NENGLOENSIS, n. sp. Loc. Nenglo, North Cachar Hills (Godwin-Austen). Shell dextral, elongately fusiform, large, solid; sculpture very fine, moderately distant ribbing ; colour pale ochraceous ; spire high, with flat sides, apex acuminate; suture shallow; whorls 8k, sides flatly convex ; constriction some distance behind the aperture, on side ; aperture widely ovate, expanded towards the outer margin; peristome double, not thickened; columellar margin subvertical, the tooth very small and remotely situated. Size: maj. diam. 2-9 ; alt. axis 5-0 millim. This is a very distinct shell; in its very ovate aperture and small columellar process or tooth it is unlike any other I have in m y collection. DIPLOMMATINA DISTINCTA, n. sp. Loc. North of Burrail Range, Naga Hills (Godwin-Austen). Shell dextral, small, rather depressedly fusiform ; sculpture very fine close ribbing; colour pale horny ; spire conoid; apex blunt; suture impressed ; whorls 7, sides convex, the antepenultimate the largest; constriction on the side, well behind the aperture ; aperture vertical, irregularly ovate ; peristome thin; columellar tooth very large for size and in front. Size : maj. diam. 2-0 ; alt. axis 3'4 millim. There is only one specimen of this species, but it is very different from any of the smaller forms in having the constriction behind the aperture, and, for so small a shell, in having the columellar tooth so large. |