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Show 1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 513 Lt. Woodthorpe, R.E. Butler was a splendid officer for such a frontier, and the Survey owed much to his untiring aid and to the interest he took in its proper extension. DIPLOMMATINA AMBIGUA, n. sp. Loc. South of Burrail Range, Munipur (Godwin-Austen). Shell dextral, large, solid; sculpture fine, rather close costulation on all the whorls; colour horny white ; spire high, sides rather flat above, apex rather acuminate; suture impressed ; whorls 8, flatly convex ; constriction in front, above the aperture ; aperture oval, vertical; peristome strong, closely double, reflected; columellar tooth small for size of the shell, situated well in front and directed downwards. Size : maj. diam. 3 0 ; alt. axis 5'5 millim. This is one of the largest species from these mountains. I also got it at Kezakenomih; one specimen measuring 6*5 millim. in height of spire. DIPLOMMATINA COMMUTATA, n. sp. Loc. Prowi, Lahupa Naga Hills (Godwin-Austen). Shell dextral, elongately fusiform ; sculpture, 4 apical whorls finely costulated, the last whorls nearly smooth ; colour pale sienna ; spire with convex sides ; suture moderately impressed; whorls 7\, sides convex, antepenultimate rather the largest; constriction in front, above the aperture, but to the right side; aperture oval, vertical; peristome double ; columellar tooth sharp, well developed, directed downwards and well in front. Size : maj. diam. 1'75 ; alt. axis 3*0 millim. A large form of this I found at Tellizo Peak, Anghami Naga Hills, on the North Munipur frontier line. Constriction on side, behind the peristome; sculptured throughout. DIPLOMMATINA DOHERTYI, n. sp. Loc. Margarita, Upper Assam (TV.Doherty,in coll. T. H. Aldrich). Shell dextral, very tumidly fusiform, strong, not rimate ; sculpture fine rather distant costulation on all the whorls; colour very pale, with a pinkish tint or ochraceous; spire, sides flat, rapidly diminishing, apex acuminate; suture impressed ; whorls 8, last 3 whorls with convex sides, the penultimate the largest; constriction on side, well behind the aperture ; the last whorl rises near peristome; aperture nearly circular, subvertical, rounded below ; peristome double, outer somewhat reflected, and sinuous on margin ; columellar tooth small, blunt, situated within the aperture, in many specimens it is not seen when viewed directly in front. Size : maj. diam. 3'0 ; alt. axis 6*4 millim. This shell is from the Eastern Naga country; there were two lots in Mr. Doherty's collection-one with a few specimens labelled " Margarita," another, a numerous lot, marked only " Naga." |