1895.] BORNEO AiS^D SEIGHBOtTRING ISLANDS. Ill 



31. SiTALA BUSAUBNSIS. (Plate III. fig. 9.) 



Testa anguste ]jerforata, conica, ad peripheriam carinata, dilute 

 fusco-oornea ; anfractus 6, convexiuscuU, lb-is obliqids tenuissimis 

 confertis arcuatis, sutura carinata sejuiicti, ultinms infra 

 carinam paulum conve.vus, nitidior, concentrice tenuiter striatus ; 

 apertura parva ; columella rectiuscula, leviter incrassata et 

 reflexa. 

 Diam. maj. 3*5 millim., alt. 3*7. 

 Hah. Busau, Sarawak. 



The distinguishing features of this species are the well-marked fine 

 oblique lirations upon the upper surface and the concentric striae 

 of the base. In form it is very like S. angulata, Issel. 



32. SiTALA CAKA. (Plate III. fig. 10.) 



Testa trocJioidea, anguste perforata, tenuis, cornea, subpellucida, 

 carinata ; spira conica, ad apicem obtusiuscula ; anfractus 6, 

 convexi, lineis incrementi tenuissimis obliquis sculpti, lente 

 accrescentes, ultimus infra carinam leviter convexus, striis con- 

 centricis minutis ornatus ; apertura parva, lunata, vix obliqua ; 

 peristoma tenue, margine columellari declive paulo rejlexo, hand 

 incrassato. 



Diam. maj. 3*3 millim,., alt. 3'2. 



Hah. Gomanton, N.E. Borneo. 



Very like S. angidata, Issel, but rather higher in proportion to 

 the width, and without spiral strise upon the spire. 



33. SiTALA DULCis. (Plate III. fig. 11.) 



Testa depresse turbinata, minute perforata, hand carinata, fusco- 

 cornea, sericata, striis incrementi ohliquis aliisque spiralihus con- 

 fertis microscopice cancellata ; spira hrevis, convexa, obtusa ; 

 anfractus 4|, perconvexi, sutura profunda sejuncti, ultimus ad 

 ■perijyheriam acute rotundatus vel vix subangulatus, inferne 

 concentrice striatus ; apertura lunata, vix obliqua ; peristoma 

 tenue, margine columellari arcuato, superne dilatato et rejlexo. 



Diam. maj. 2*5 millim., alt. vix 2. 



Hah. Gomanton, N.E. Borneo. 



In comparison with the other Bornean Sitalce, the present 

 species is less conical. It is allied to S. orchis, Godwin-Austen, 

 but much more finely striated. 



34. SiTALA ACCEPTA. (Plate III. fig. 12.) 



Testa angustissime perforata, rotunde conica, ad peripheriam 

 carinata, cornea, subpellucida, lineis spiralihus microscopicis 

 incrementique tenuissimis decussata ; spira convexe conoidea, 

 superne obtusa ; anfractus 5-5|, convexi, lente accrescentes, 

 sutura carinata profunda discreti, ultimus infra carinam gracil- 

 limapaulo convexus, concentrice striatus ; apertura parva, irregu- 

 lariter lunata, vix obliqua ; peristoma tenuc^ margine columellari 

 valde incrassato suhrejlexo, perpendiculari cum basalt unguium 

 levem fo rmante. 



