ATTRICXTLID&. 81 



slightly inflated above, attenuated and more distinctly grooved 

 at base, contracted anteriorly; aperture rather oblique, extremely 

 narrow ; parietal plaits two, the upper rather oblique, the other 

 bifid externally ; columellar plait transverse ; peristome straight; 

 right margin furnished with an external pale border, simple at 

 its upper part, callous and thickened below, bearing three teeth. 

 Length 5, breadth 3 mill. 



Plecotrenia punctatostriata, H. and A. Adams in Proc. Z. S. 1853, 



p. 121. 



Pfr. Si/n. Auric, n. 106 ; Mon. Auric, p. 106. 

 Plecotrenia punctostriata, H. and A. Adams, Gen. rec. Moll. ii. 



p. 241. 



Hah. Borneo and Singapore {Taylor). 



13. PLECOTEEMA IMPERFOKATA. 



Shell imperforate, ovate-conic, solid, with punctured spiral 

 strise, opaque, of a dirty fulvous colour ; spire conoidal, with the 

 apex rather blunt; whorls five to six, flat, with two deep 

 grooves near the suture, the last forming two-thirds of the total 

 length, attenuated and spirally furrowed at base, slightly con- 

 tracted anteriorly ; aperture oblique, extremely narrow ; pa- 

 rietal plaits two, the upper laniellifomi, oblique, the other 

 deeply bifid ; columellar plait compressed, transverse ; peristome 

 straight ; right margin sharp, bearing within three to four small 

 teeth on a white callus ; columellar margin indistinct. Length 

 5, breadth 3^ mill. 



Plecotrenia imperforata, H. and A. Adams in Proc. Z. S. 1853, 

 p. 120; Gen. rec. Moll. ii. p. 241. 



Pfr. Syn. Auric, n. 107 ; Mon. Auric, p. 106. 

 Hah. Isle of Negros, Philippines. 



§ 3. Aberrant species. 



14. Plecotrema Cubensis. 



Shell minute, subperforate, ventricosely fusiform, thin, spirally 

 striated under a lens, slightly hairy, transparent, yellowish horn- 

 coloured ; spire conic, rather blunt ; whorls five, scarcely convex, 

 the last a little longer than the spire, slightly angled above, 

 attenuated at base; aperture nearly perpendicular, oblong; 

 parietal plaits two, compressed, the upper one minute, the other 

 very indistinctly bifid ; columellar plait strong, transverse ; peri- 

 stome sharp, with the margins united by a callus ; right margin 

 sinuated above, callous within, and bearing two teeth; coln- 



e 5 



