12 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.81,aet.6 



separate spaces of somewhat irregular width. The summit of the 

 whorls is not crenulated by these impressed lines. Peripheiy well 

 rounded ; base moderately long, well rounded, marked by the feeble 

 continuations of the above-mentioned impressed lines. Aperture 

 moderately long ; outer lip thin ; columella short, truncated anteriorly 

 and slightly sinuous. Parietal wall covered by a thin callus. 



Type.— The type, U.S.N.M. No. 403916, has 6.5 whorls, and meas- 

 ures: Height, 10 mm; diameter, 3 mm. 



Remarks. — U.S.N.M. N(; 403892 contains eight additional 

 specimens. 



I'. ! 6CVE1NMENT PRJNTING OFFICE. 1331 



