attriculidje. 79 



8. Plecotrema exarata. 



Shell scarcely subperforate, ovate-conic, sliglitly striated, 

 and regularly sculptured with spiral furrows, rather shining, 

 blackish-brown; spire conic, pointed; suture linear; whorls 

 eight, scarcely convex, the last longer than the spire, slightly 

 attenuated at" base, indistinctly crested behind the aperture, 

 contracted anteriorly ; aperture nearly perpendicular, narrow ; 

 parietal plaits two, the upper small, oblique, the other indi- 

 stinctly bifid externally; columellar plait middle-sized, some- 

 what ascending ; peristome simple, acute, with the margins 

 united by a shining deposit ; right margin rather straight, bear- 

 ing within two teeth on the middle ; columellar margin sinuate, 

 affixed. Length 6, breadth 4 mill. 



Plecotrema exarata, H. and A. Adams in Proc. Z. S. 1853, p. 122 ; 

 Gen. rec. Moll. ii. p. 241. 

 Pfr. Syn. Auric, n. 102 ; Hon. Auric, p. 104. 



Hah. Borneo. 



9. Plecotrema striata. B.M. 



Shell imperforate, ovate-conic, solid, sculptured with un- 

 equally distant spiral furrows, several of which are interrupted, 

 slightly shining, blackish ; spire conic, with the outlines curvi- 

 linear, and the apex mucronate ; suture bordered ; whorls seven, 

 rather flat, the last much longer than the spire, convex, attenu- 

 ated at base ; aperture rather oblique, oblong ; parietal plaits 

 two, the upper lamelliform, oblique, the other shortly bifid ex- 

 ternally ; columellar plait strong, transverse ; peristome straight, 

 sharp, with the margins united by a broad deposit ; right margin 

 bidentate within ; columellar margin scarcely dilated. Length 

 7, breadth 4| mill. 



Laimodonta striata, Nutb. ? 



Auricula striata, PhiUppi in Zcitschr. f. 3Ialak. 1846, p. 98. 

 Pedipes insequalis, C. B. Adams, MSS., teste H. and A. Adams. 

 Plecotrema imequalis, H. and A. Adams in Proc. Zool. Soc. 1858, 

 p. 122 ; Gen. rec. Moll. ii. p. 241. 

 Pfr. Syn. Auric, n. 103. 

 Plecotrema striata, Pfr. Mon. Auric, p. 104. 

 Ellobium striatum, "PhiUppi" H. and A. Adams, Gen. ii. p. 238? 



/3. Bight margin bearing the teeth on a perpendicular callous 

 crest. 



Plecotrema labrella, II. and A. Adams, Proc. Zool. Soc. 1852, 

 p. 122. 



