1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 513 



Lt. Woodthorpe, R.E. Butler was a splendid officer for such a 

 frontier, and the Surrey 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 7h, 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 {W. Boherty, 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 dimin- 

 ishing, 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." 



