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Show 1889.] LAND-SHELLS F R O M B O R N E O . 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. DIPLOMMATINA 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 ou 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 aud 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 remarkable form, altogether different from any with which 1 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, slightly angulate below, where in the perfect shell numerous spines were developed, the circular bases showing where they once projected ; aperture broadly ovate, suboblique ; 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 (A. 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, judging 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, n. sp. (Plate XXXVIII. fig. 7.) Shell sinistral, rimate, fusiform, elongate, turreted: sculpture minute, close, slightly raised transverse costulation; colour rich |
