178 Godwin- Austen — On the Operculated LancWhells [No. 3, 



form of the operculum, which in Khasiacus is quite smooth and concave in 

 front. It is also a smaller and more delicately formed shell. 



Altc^tjs (Dioryx) graprtctts, Blf., var. 



Hab. — Both in the Dikrang Dhiin and on Toriiputu Peak. 



Alyceus (Dioryx) URSULA, Bs., var. 



Higher in the spire, aperture proportionally larger ; whorls more 

 rounded, sutural tube only one-fourth the length, and the ribbing much 

 less fine on the swell of the whorl — differences which by some would 

 be considered quite sufficient to warrant another name being given to this 

 Dafla form. Five specimens were f ound all possessing the above character, 

 so it would appear to be quite constant. 



DlPLOMMATINA POLYPLETTRIS, Bs., var. 



Hab. — Borpani, Siijuli, and Dihiri Parbat on outermost range. 



DlPLOMMATESTA POLYPLEITRIS, Var. MINUTA. 



Hab. — Shengorh and Toruputu Peaks. 



DlPLOMMATIFA SEMIS CTJLPTA, W. Blf. 



Hab. — Borpani and Dikrank valley, — a good many specimens obtained. 



Diplommatina AtrsTENi, W. Blf., large var., PL VII, Figs. 8 & 8a. 



Shell dextral, ovate fusiform, moderately thick, pale horny. Sculp- 

 ture very fine, almost disappearing on the two last whorls. Sides of spire 

 moderately flat. Whorls 7, penultimate and antepenultimate the largest, 

 the last ascending slightly. Constriction in middle of aperture, which is 

 circular and vertical ; columellar margin rounded, tooth moderate. Peris- 

 tome simple, double, rather strongly formed, the inner lip continuous. 



Alt. 0-15, diam. 0-70 in. 



Hab. — Low down on the left bank of the Dikrang river ; — about a 

 dozen were found. 



This shell is very similar in form to D. Austeni, W. Blf. from the 

 Khasi Hills, but it is much larger, that shell only being O90" in length, and 

 the two last whorls are not so smooth and shew slight traces of sculpture, 

 but the two are too close to be separated. 



DlPLOMMATINA HOMEII, n. sp., PI. VII, Fig. 6. 



Shell dextral, ovate, tumidly fusiform, strong, dull ochreous, very fresh 

 shells often ruddy orange-coloured, sculpture very fine and filiform on the 

 upper whorls, rather coarser on the last approaching the aperture. Spire 



