1889.] LAND-SHKLLS FROM BORNEO. 349 



penultimate ample, the antepenultimate the largest ; aperture ovate, 

 subvertical ; peristome double, continuous, rounded on tlie onter 

 margin, angular on the columellar side ; columellar margin oblique 

 outwards, tooth small and blunt. 



Size : maj. diam. 20 ; alt. axis 3"4 iniliim. 



Hah. Bnsan ]A.\\\^{A. Everett). 



Only two specimens found in the collection. It belongs to the 

 group of sinistral Dlplommatina (Falaina). 



47. DivLOMMATiNA NiAHEMSis, u. s|). (Plate XXXVIII. figs. 

 6, 6 a.) 



Shell dextral, ovate, fusiform, solidly built ; sculpture smooth, 

 with fine costulation on the 4 ajjical whorls, but showing fine, 

 distant and indistinct on the penultimate and body-whorl ; colour 

 dark amber, very ruddy at the apex ; spire atteiuiate, sides flat ; 

 af)ex shar|) ; suture well marked ; whorls 8, rapidly increasing 

 after the filth, antepenultimate the largest, the last rising near the 

 aperture on the penultimate whorl, the constriction being on this 

 last just behind tlie aperture on right side ; aperture large and 

 broadly ovate, per[)endicular ; 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. 



IJab. THhih mWs (A. Everett). 



This is a very beautiful species of this genus and of a very remark- 

 able 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 per- 

 fect shell numerous spines were developed, the circular bases showing 

 where they once j)rojeeted ; 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. 29 ; alt. axis 6*0 ; diam. ap. 2*4 millim. 



Mab. Cave exploration A (A. Everett). 



This species has not yet been found living, and when it has it 

 will be an interesting discovery, more particularlj'^ to see what the 

 form of its spine is ; but, judging from what we now know of those 

 that ornament Opisthostoina grandi-spinosuin, they are probably 

 similar and curved and trough-like ; the perfect shell must be a 

 lovely form. 



49. DiPLOMMATINA RUBRA, u. sp. (I'late XXXVIII. fig. 7.) 



Shell sinistral, rimate, fusiform, elongate, turreted; sculpture 

 minute, close, slightly raised transverse costulation ; colour rich 



