1889. ] LAND-SHELLS FROM BORNEO. 349 
penultimate ample, the antepenultimate the largest ; aperture ovate, 
subvertical ; peristome double, continuous, rounded on the outer 
margin, angular on the columellar side; columellar margin oblique 
outwards, tooth small and blunt. 
Size: maj. diam. 2:0; alt. axis 3°4 millim. 
Hab. Busan Hills(A. Everett). 
Only two specimens found in the collection. It belongs to the 
group of sinistral Diplommatina ( Palaina). 
47. DieLomMaTINA NIAHENSIS, n. sp. (Plate XXXVIII. figs. 
6, 6 a.) 
Shell dextral, ovate, fusiform, solidly built; sculpture smooth, 
with fine costulation on the 4 apical whorls, but showing fine, 
distant and indistinct on the penultimate and body-whorl; colour 
dark amber, very ruddy at the apex; spire attenuate, sides flat ; 
apex sharp; suture well marked; whorls 8, rapidly increasing 
after the fifth, antepenultimate the largest, the last rising near the 
aperture on the penultimate whorl, the constriction being on this 
last just behind the aperture on right side; aperture large and 
broadly ovate, perpendicular; peristome double, much thickened 
and developed, sharply angulate below and at the upper outer margin, 
which is sinuate as viewed from the right side; columellar tooth 
very large and strong, the margin perpendicular. 
Size: maj. diam. 2°7 ; alt. axis 4°4 millim. 
Hab. Niah Hills (A. Everett). 
This is a very beautiful species of this genus and of a very remark- 
able form, altogether different from any with which I am acquainted. 
48. DipLomMatiNa spinosa, n. sp. (Plate XXXVIII. fig. 1.) 
Shell dextral, elongately turreted; sculpture worn off; colour 
completely faded; spire high, attenuate ; apex pointed; suture 
moderate ; whorls 9, the penultimate and antepenultimate equal, last 
ascending, rounded above, shghtly angulate below, where in the per- 
fect shell numerous spines were developed, the circular bases showing 
where they once projected; aperture broadly ovate, subobligue ; 
peristome double ; outer lip rises halfway up the penultimate whorl, 
covering it in front ; columellar margin straight, with well-developed 
blunt tooth. 
Size: maj. diam. 2:9; alt. axis 6:0; diam. ap. 2°4 millim. 
Hab. Cave exploration A (4. Everett). 
This species has not yet been found living, and when it has it 
will be an interesting discovery, more particularly to see what the 
form of its spine is; but, judgiug from what we now know of those 
that ornament Opisthostoma grandi-spinosum, they are probably 
similar and curved and trough-like; the perfect shell must be a 
lovely form, 
49. DipLoMMATINA RUBRA, 0. sp. (late XX XVIII. fig. 7.) 
Shell sinistral, rimate, fusiform, elongate, turreted; sculpture 
minute, close, slightly raised transverse costulation; colour rich 
