420 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



The specimen described and figured (U.S.N.M. no. 313624) has 5 

 whorls and measures: Length, 25.6 mm; greater diameter, 25.5 mm; 

 lesser diameter, 22.3 mm. This and a large series of specimens were 

 collected by Worcester and Bourns on the Menage Expedition some- 

 where in northeastern Mindoro. A hundred of them yield the follow- 

 ing additional measurements: 



