TORTAXIS. 11 



shining. Spire much produced and long-tapering, the apex 

 large and obtuse. Whorls 11, a little convex, the first smooth, 

 the rest ornamented with close, slightly oblique, irregular, 

 longitudinal striae, plicate at the suture. Suture impressed 

 and lacerated by the plicaa. Last whorl oblong, tapering 

 above. Aperture distinctly oblique, oblong, tapering above, 

 the margins joined by a glossy callus. Columella at first 

 arcuate above, posteriorly thickened and vertically truncate- 

 plicate. Lip arcuate, acute but a little thickened, but with- 

 out marginal lip. Color greenish-corneous. Alt. 33, diam. 8, 

 aperture 7 mm. high, 5 wide (Anc.). 



Tonkin: Bac-Kan and That-Khe (Messager). 



Spiraxis pilsbryi ANC., Journ. de Conch., li, 1903, p. 218, 

 pi. 9, f. 15, 16. 



This species is distinguished by the more cylindric form, 

 more narrowly lengthened, its aperture less high, and its peri- 

 stome not so much thickened (Anc.). 



9. T. LUBRICUS (Dautzenberg). PI. 2, figs. 30, 31. 



Shell imperforate, thin but rather strong, yellowish- corne- 

 ous, slightly translucent, cylindric-turrited, the apex very 

 obtuse. Whorls fully 9, quite convex, the apex rounded, 

 rather large, first two whorls smooth, the rest striatulate, the 

 striae a trifle stronger and retracted near the suture. Aper- 

 ture small, ovate, slightly oblique, the outer lip thin; arched 

 forward above. Columella concave above, then convex and 

 calloused, obliquely truncate below. 



Length 23.5, diam. 6, length aperture 5.9 mm. ; whorls 9^. 



Length 23, diam. 5.7, length aperture 5.8 mm. ; whorls 9 1 / 4. 



Length 20, diam. 5, length aperture 5.3 mm.; whorls 8%. 



Tonkin, near Haiphong. 



Described and figured from specimens supplied by Mr. 

 Dautzenberg, but I have been unable to find the original de- 

 scription. It is a more slender, lengthened shell than T. 

 erectus-j narrower and more cylindric than T. mandarinus. 



A young shell fell out of one of the specimens. It is glob- 

 ular, about 2 mm. diam. and alt., with strongly truncate 

 columella (pi. 12, fig. 1). 



