506 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



fig. 3, which is a copy of it). This shell has 5.5 whorls and measures: 

 Length, 57.8 mm; greater diameter, 31.8 mm; lesser diameter, 

 26.7 mm. 



A series of 40 specimens, collected by Mr. de Mesa at Ariod, 

 Naujan, Mindoro, furnishes the following data: 



