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Show 1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 511 that the constriction was more to the right, directly over the outer margin of the peristome. From Prowi, specimens were still smaller in size, 3-8 millim. Constriction in front, above the peristome ; last whorls smooth. DIPLOMMATINA GAROENSIS, n. sp. Loc. Garo Hills; exact locality unknown (W. Robert). Shell dextral, globosely fusiform, solid ; sculpture, distant, very fine ribbing on the 3 apical whorls, the rest smooth and shiny ; colour pale ochraceous ; spire high, side very convex ; apex acuminate, and when viewed from the side the axis is curved; suture impressed ; whorls 6|, all tumid, the antepenultimate much swollen and by far the largest; constriction above the aperture; aperture vertical, oval; peristome very much thickened and double ; colu-mellar tooth moderately large. Size: maj. diam. 2*3 ; alt. axis 3'5 millim. This species may be known by its very large antepenultimate whorl and the curved axis of the spire, and its strongly developed peristome and smooth lower whorls. It formed part of a collection of shells made by Mr. W . Robert, of the Khasi Hills Survey party, in the Garo Hills, during the military expedition into them in 1872- 73. Ten specimens were found. DIPLOMMATINA ELONGATA, n. sp. The typical shells of my D. tumida (J. A. S. B. xxxix. pt. 2, p. 6, pi. ii. f. 2) came from Neuglo in the North Cachar Hills, not far from Asalu. As I collected eastward the form changed, so that in Munipur it does not correspond with the original type. Thus on Nougmaiching Peak, 5135 ft., which is a conspicuous point seen from Imphal, the capital of Munipur, and lying to the east of the valley, a small form occurred, with the peristome less circular, the form less tumid, and quite smooth on the last whorls. On Laisen Peak, 5173 ft., in the mountains to the north of Munipur, occurred another variety, which I describe below. At Kezakenomih I found examples of a species which I described and figured in 1875 (J. A. S. B. vol. xliv. pt. 2, pi. iv. fig. 7) as D. tumida, var. This, however, seems so very distinct, now that we have a much larger series to look over, that it must stand under another specific title, and I have named it D. E L O N G A T A , n. sp.: this was the original description:- " Shell elongately fusiform, thin, pale yellowish green ; sculpture very faint above, quite smooth on the three last whorls; spire attenuate, sides flat; suture moderate; whorls 8^ to 9, the antepenultimate the largest; constriction in front above the aperture; last whorl ascends slightly ; aperture oval, vertical; peristome double, thickened, slightly reflected; columellar tooth small and remote. Alt. 0 2 2 ; diam. 0-13 inch. "Hab. Kezakenomih, Naga Hills." 35* |
