MOLLUSCA OF INDIA. 11 



aperture oval and vertical ; peristome double, strong, continuous ; 

 columellar tooth well developed, rather remote. 



" Size : maj. diam. 2-2 ; alt. axis 4*8 to 5 2 mm. 



" Six specimens were found. 



" A form rather longer and less swollen occurs in the same range ; 

 about 30 specimens were obtained at Gna,meh Peak (5585 feet), 

 near the Barak River. 



" There is another form much smaller, being only 3"5 mm. in length, 

 with the same glassj' last whorls and the constriction rather further 

 back, behind the aperture. Examples of this were also found at 

 Sikhamih, in the Lahupa Naga Hills. I distinguish this variety 

 as JcJiuJihoeiisiSy var. minor. ''^ 



DiPLOMMATiNA LAPiLLUs, Godwiu-Austeu. (Plate LXV. figs. 6, 6«.) 



Dijihmmatwa lapillus, G.-A. P. Z. S. 1892, p. 515. 



Locality. Kopamedza Peak, Lahupa Naga Hills, 8375 ft. ( Godwin- 

 Austen). 



Original description : — " Shell dextral, elongately fusiform, tumid 

 below, not rimate ; sculpture fine, regular, close costulation, which 

 is often much worn down ; colour (bleached) ; spire with sides 

 flattened, apex acuminate ; suture shallow ; whorls 8, sides flatly 

 convex, the antepenultimate the largest ; constriction of the pen- 

 ultimate whorl on the side, well behind the aperture ; aperture oval, 

 sxxbvertical ; peristome thickened, double, rounded below ; columellar 

 tooth small and far back within the aperture. 



"Size: maj. diam. 3-0; alt. axis 6-0 mm. 



" Three specimens, marked from the ' north of the Burrail Range.' 

 Two are from the typical locality given above." 



DiPLOMMATiNA coMPACTA, Godwln-Austeu. (Plate LXV. figs. 7, 

 7 a, 7 h.) 



Diplommatina compacta, G.-A. P. Z. S. 1892, p. 515. 



Localit)/. South of Barak in Munipur {Godwin-Axisten). 



Original description : — " Shell dextral, small, tumidly fusiform ; 

 sculpture, the two apical whorls smooth, two next with fine close 

 ribbing, the last three whorls smooth or glassy ; colour pale ochra- 

 ceous white ; spire, sides rather flat, apex moderately blunt ; suture 

 slightly impressed ; whorls 7|, the antepenultimate the largest and 

 tumid ; constriction on the side, well behind the aperture, at about 

 1 millim. distant ; aperture oval, vertical ; peristome double ; colu- 

 mellar tooth large in front, and directed downwards. 



" Size : maj. diam. 1-8 ; alt. axis 35 mm. 



" A larger shell (fig. 7 h), with rather a different shaped spire 

 4 mm. in height, was found at Asalu, with the constriction in same 

 position. 



"It is an allied form of D. jatingana, from the North Cachar 

 Hills, which is a larger, more tumid species, with the constriction 

 farther behind the aperture (PI. LXV. figs. 8, 8 a). 



