516 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



lip is expanded and reflected. The columella is rather narrow, also 

 reflected, forming a narrow umbilicus. The parietal wall is covered 

 by a moderately thick callus. 



The type (U.S.N.M. no. 313713), collected by Pedro de Mesa at 

 Binuangan, Principality of Paluan, Mindoro, has 6 whorls and meas- 

 ures: Length, 49 mm; greater diameter, 26 mm; lesser diameter, 22 

 mm. 



A series of topotypes, also collected by Mr. de Mesa, yields the 

 following data: 



U.S.N.M. no. 313648 contains six specimens from Pula, Principality 

 of Paluan, Mindoro, which I am provisionally referring here, also 

 collected by Mr. de Mesa. 



