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 acumi- 

 nate, 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 hy 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. elongata, 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 ante- 

 penultimate 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. 

 A-lt. 0-22; diam. 0-13 inch. 



" Rab. Kezakenomih, Naga Hills." 



35* 



