514 HEUT.-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 7h, sides convex, the ante- 

 penultimate 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 

 PoHtical Agent of Munipur, while the boundary of that State was 

 being surveyed by me in 1 872-73 ; in carrying out this work he 

 rendered us great assistance, although much thwarted by the un- 

 friendly 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, sohd ; sculpture very 

 fine, moderately distant ribbing ; colour pale ochraceous ; spire high, 

 with flat sides, apex acuminate ; suture shallow ; whorls 8^, 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 my col- 

 lection. 



DiPLOMMATINA DISTINCTA, n. Sp. 



Loc. North of Burrail Eange, 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. 



