342 BULLETIN" 10 0, UNITED STATES NATIONAL MUSEUM 



Type.— The unique type. U.S.N.M. No. 313001, was donated by 

 "Walter F. Webb. It comes from Ilin Island, which lies a short- 

 distance off the south coast of Mindoro. It has 4.8 whorls, and 

 measures: Height, 13 mm: greater diameter, 14.2 mm; lesser diame- 

 ter, 19 mm. 



o 



