78 ATJBictrLiD^:. 



Plecotrema decussata, H. and A. Adams in Proc. Z. S. 1853, 

 p. 121 ; Gen. rec. Moll ii. p. 241. 



Pfr. Si/n, Auric, n. 100; Mon. Auric, p. 102. 



Hab. Philippine Islands. 



6. Plecoteema bicolor. 



Shell suhumhilicate, ovate-conic, solid, marked with close- 

 set spiral furrows, irregularly tuberculated with longitudinal 

 wrinkles, rather shining, brown with pale hands ; spire conic, 

 with the outlines rather convex, and the apex pale and pointed ; 

 whorls nine, scarcely convex, the last a little longer than the 

 spire, somewhat turgid above, attenuated at base, compressed 

 round the perforation (which is not pervious), furnished ante- 

 riorly with an elevated crest and contracted ; apertm'e scarcely 

 oblique, oblong ; parietal plaits two, parallel to each other, the 

 lower one slightly divided externally; columellar plait small, 

 transverse; peristome slightly spreading, with the margins joined 

 by a deposit ; right margin bearing two minute teeth. Length 



6, breadth 3£ mill. 



Plecotrema bicolor, Pfr. in Proc. Z. S. 1855, p. ; Mon. Auric. 



p. 103. 

 Hab. Port Jackson (Strange). 



§ 2. Sliell rather imperforate. 



7. Plecotrema clausa. 



Shell scarcely subperforate, ovate-conic, ventricose, solid, re- 

 gularly girdled with rather crowded elevated spiral ridges, 

 shining, reddish-brown, or pale fulvous; spire conic, with 

 the apex pointed ; whorls eight, rather flat, the last longer than 

 the spire, thickened anteriorly into a strong blunt crest, attenu- 

 ated at base; aperture scarcely oblique, extremely narrow; 

 parietal plaits two, the upper compressed, oblique, the other 

 bifid exteriorly; columellar plait compressed, transverse; pe- 

 ristome thin, with the margins united by a broad callous labium ; 

 right margin cut out at its upper part, then shortly produced, 

 furnished within with two strong teeth; columellar margin 

 narrowly spreading. Length 7, breadth 4 mill. 

 Plecotrema clausa, H. and A.Adams in Proc. Z. S. 1853, p. 121; 



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

 Pfr. Sun. Auric, n. 101 ; Mon. Auric, p. 103 ; Novit. Conch. 

 i. p.' 15. n. 25. t. 5. f. 9-11. 

 Hab. Sandwich Islands. 



