1875.] Species of Opereulated Land- Shells. 9 



Diplommatina. Sherfaiensis, var., Plate IV, Fig. 5. 



A form similar to that from the Peak of Sherfaisip, North Cachar 

 Hills, described in J. A. S. B., Vol. XXXIX, 1870, p. 3, and differing from it 

 only in its much more tumidly fusiform shape and larger size. 



Alt. 0-14, diam. 009 in. 



It was very abundant on the Peak of Japvo at 10,000 ft., and shews an 

 interesting divergence from the form fouud at the highest elevation of the 

 same range further west. On the Peak of Shiroifurar at an equal altitude 

 but 10 miles to the south-east, the form, with the same essential characters, 

 had again changed into a still larger and more solid shell with a more acu- 

 minate spire, yet the differences from the original type are not sufficient 

 on which to found a new species. 



Diplommatena tumid a, var., Plate IV, Fig. 7. 



Shell elongately fusiform, thin, pale yellowish green, sculpture very 

 faint above, quite^smooth on the 3 last whorls, spire attenuate, sides flat, 

 suture moderate; whorls 8| to 9, the antepenultimate the largest, con- 

 striction in front, above the aperture, last whorl ascends slightly ; aper- 

 ture oval, vertical, peristome double, thickened, slightly reflected, columellar 

 tooth small and remote. 



Alt.^0-22, diam. 13 in. 



Sab. — Kezakenomih, Naga Hills. This shell is a better type of 

 this form of Dlplommatina than the very tumid shell first described from 

 .Asalu ; the form changes much in different localities, in some being much 

 more solid and more distinctly and distantly sculptured near the apex ; a 

 variety from the Eastern Burrail is 20" in alt., rich dark amber coloured, 

 has the 3 lower whorls smooth and glassy, the columellar tooth still more 

 remote, and the constriction just behind the peristome ; it departs so 

 widely from the original type that it might almost be separated. Accurate 

 drawings of a series of specimens are requisite to shew these gradual changes, 

 and these I hope to be able to give hereafter. 



DlPLOMilATESTA CONVOLTTTA, 11. sp., Plate IV, Fig. 8. 



Shell dextral, elongately fusiform, solid, pale yellowish or greenish 

 horny, very finely costulated towards the apex, 2 last whorls smooth, 

 striated near the aperture, spire with rather flattened sides, suture im- 

 pressed; whorls 8, antepenultimate the largest, the penultimate constricted 

 at -| turn behind the peristome, the last ascends very sharply, contracting 

 the breadth of the penultimate very considerably ; aperture sub-vertical, 

 lying to the right of the axis, peristome circular, solid, double, the tooth 

 small and situated far within the columellar margin, lip scarcely reflected. 

 Animal not seen. 



Alt. 0-25, diam. 015 in. 

 2 



