178 LAND AND FRESHWATER 
siderably in the sculpture of the lower whorls, which are in most 
specimens quite smooth. One individual sent is considerably 
more tumid than the type, but presents no other difference of 
importance.” 
DIPLOMMATINA SALTUENSE, Nn. sp. (Plate XLV. figs. 6, 6a.) 
Locality. Jatinga valley, North Cachar Hills. 
Shell dextral, not rimate, umbilicated, ovately fusiform ; sculpture 
distant, strong costulation on all the whorls; colour ruddy ochre, 
strong on apex; spire conic acuminate, sides flat near apex, which 
is rather pointed; whorls 63, the three last much rounded, the 
antepenultimate the largest, the constriction in middle above the 
aperture ; aperture circular, perpendicular; peristome very solid, 
double ; columellar margin straight, the tooth pointed. 
Size: major diam. 1:4, alt. axis 2-4 mm. 
- 0:06;. 9.5. )).) 0710 anch: 
This species, which assimilates in general form to D. polypleuris, 
&c., yet differs considerably in the attenuation of the apex and 
proportion of the whorls, being more like in this respect D. dafla- 
ensis. A considerable number were collected. 
DrpeLoMMATINA SILVICoLA, n. sp. (Plate XLV. figs. 3, 3a.) 
Locality. Jenta Hajuma Peak, 5127 feet (G.-A.), North Cachar 
Hills. 
Shell somewhat depressedly ovate, not rimate; sculpture, regu- 
larly well-marked distant costulation ; colour pale sienna-brown ; 
spire conic, sides convex, apex rather blunt ; whorls 6, rounded, the 
last rather small, penultimate the most swollen, constriction in 
middle and above the aperture ; aperture vertical, circular ; peri- 
stome double and solid, columellar margin subvertical, tooth 
strong. 
Size: major diam. 1°3, alt. axis 2°2 mm. 
- 0:05, ,, 0-09 inch. 
I obtained only six specimens of this shell, in the dense lofty 
forest of the highest part of the North Cachar Hills. It approaches 
D, austeni in its general form, but is more depressed, and its sculp- 
ture is very defined. 
DIPLOMMATINA SILVICOLA, small var. (Plate XLV. figs. 5, 5a.) 
Locality. Jatinga valley, North Cachar Hills. 
A shell which in general shape and sculpture is very similar to 
the last described was very abundant in the above valley, which 
drains from the Jenta Hajuma ridge. It is evidently a dwarf form, 
and measures only 1°7 mill. in height. 
