174 LAND AND FRESHWATER 
coming gradually swollen to the apex ; aperture small, subvertical, 
round; peristome continuous, closely double; columellar margin 
weak, no tooth, the twist on columella seen within the aperture. 
Size: major diam. 1:2, alt. axis 2°2 mm. 
a 0:05, ,, 0:09 inch. 
DIPLoMMATINA THEOBALDI, n.sp. (Plate XLIX. figs. 11, 11 a.) 
Locality. Darjiling (Theobald). Only one specimen. 
Shell sinistral, globosely scarcely rimate, constriction central, 
above the aperture ovate, somewhat gibbous ; sculpture smooth, with 
rather close costulation, high and sharp near aperture ; colour pale 
umber ; spire bluntly conoid, apex obtuse ; suture moderately im- 
pressed ; whorls 5, sides flat in front, rounded at back ; aperture 
subvertical oval; peristome double, not continuous; columellar 
margin curved, no tooth visible viewed from the front, but seen 
slightly well within the aperture. 
Size: major diam. 1-4, alt. axis 2°3 mm. 
3 G-06;. =... —0-Coamen: 
This interesting sinistral species, the first I have seen from the 
Darjiling Hills, is another similar to D. jaintiaca of the mountains 
south of the Brahmaputra, but differs in many respects, particularly 
in its tumid small size and the absence of the columellar tooth. 
DIPLOMMATINA DAFLAENSIS, n. sp. (Plate XLV. figs. 4, 4 a.) 
Diplommatina austeni (large var.), Godwin-Austen, Journ. A. 8. B. 
1876, p. 179. 
Locality. Dikrang valley, Dafla Hills (G.-A.). 
Comparing this more closely with the form from the Khasi Hills 
(figs. 2, 2a), it differs very much in its general shape, being much 
smaller below, the antepenultimate being much larger in proportion 
to the penultimate ; the apex is more attenuate, and the sculpture 
differs. It must therefore be distinguished as a species. 
Original description:—* Shell dextral, ovately fusiform, mode- 
rately thick, pale horny. Sculpture 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. Peristome 
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. BIf., from 
the Khasi Hills, but it is much larger, that shell being only 0-90 inch 
in length, and the two last whorls are not so smooth and show 
slight traces of sculpture.” 
