8 LAND AND FRESHWATER 



smooth ; colour pale greenish ; spire with convex sides, apex 

 acuminate ; suture well impressed ; whorls 7|, penultimate and 

 antepenultimate equal ; constriction above the aperture but towards 

 the right-hand side ; aperture oval, vertical ; peristome thickened, 

 double ; columellar margin straight and angulate below, the tooth 

 in front, moderately large. 



"Size: maj. diam. 2-4; alt. axis 5-0 mm," 



DiPLOMMATiNA AMBiGUA, Godwin-Austcu. (Plate LXIV. fig. 2.) 



Diplommatina aynbiijua, G.-A. P. Z. S. 1892, p. 513. 



Locality. South of Burrail Range, Munipur {(xodwin- Austen). 



Original description : — " 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 mm. 



" This is one of the largest species from these mountains. I also 

 got it at Kezakenomih ; one specimen measuring &5 mm. in height 

 of spire."' 



"DiPLOMMATiNA coMMTJTATA, Godwln-Austen. (Plate LXIV. fig. 4.) 



Diplommatina commutnta, G.-A. P. Z. S. 1892, p. 513. 



Locality. Prowi, Lahupa Naga Hills {Godwin- Austen). 



Original description :■ — " Shell dextral, elongately fusiform ; sculp- 

 ture, 4 apical whorls finely costulated, the last whorls nearly 

 smooth ; colour pale sienna ; spire with convex sides ; suture 

 moderately impressed ; whorls 7-i-, 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 mm. 



" A large form of this I found at Tellizo Peak, Anghami Naga 

 Hills, on the North Munipur frontier-line." 



DiPLOMMATiNA GAROENSis, Godwiu-Austcn. (Plate LXIV. 

 figs. 3, 3 a.) 



Diplommatina garoense, G.-A. P. Z. S. 1892, p. 511. 



Locality. Garo Hills ; exact locality unknown ( W. Eohert). 



Original description ; — " 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 ante- 

 penultimate much swollen and by far the largest ; constriction 

 above the aperture ; aperture vertical, oval ; peristome very much 

 thickened and double ; columellar tooth moderately large. 



