532 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



summit. Sutures suuplc. well mtirked. Periphery and base of the 

 last whorl well rounded, the latter somewhat elono-ated. Umbilicus 

 faint. Aperture quite laroe, pyriform, posterior angle obtuse, outer 

 lip moderately thick; columella very oblique, fairly strong, revolute, 

 with a stronji" fold somewhat anterior to its insertion; parietal wall 

 covered with a fairly strong callus. 



The type (Cat. No. ^2'2S21, U.S.N.M.) comes from Neah Bay, Wash- 

 ington. It has 6 post-nuclear whorls and measures: Length 0.1 mm., 

 diameter 8. 1 mm. 



