180 OPEAS, PHILIPPINE IS. 



Luzon: Mt. Arayat and Antipolo Mts. 



f Stenogyra montana SEMP., Reisen p. 139. 



84. 0. ARAYATENSE (Semper). 



Shell ovate-conic, imperforate, the apex obtuse, pellucid, 

 very smooth, glossy. Whorls 7, rounded, gradually increas- 

 ing, the base of the last rounded, one-third the total length. 

 Aperture ovate-trigonal, subvertical, the columellar margin 

 inflexed at base, strongly reflexed at the insertion. Length 

 8, diam. 3, aperture 2.5x1.5 mm. (Semp.). 



Luzon: Mt. Arayat. 



f Stenogyra arayatensis SEMPER, Reisen p. 139. 



85. 0. MINUTUM (Semper). 



Shell ovate-conic, glossy, diaphanous, waxen, covered per- 

 forate, the apex obtuse. Whorls 5y 2 , nearly flat, the last one- 

 third the total length. Aperture ovate-oblong; columellar 

 margin widely reflexed at the insertion. Length 5, diam. 2, 

 aperture 1.5x1 mm. (Semp.) 



Luzon: Mt. Arayat. 



f Stenogyra minuta SEMPER, Reisen p. 139. 



86. 0. HEXAGYRUM Boettger. PI. 19, fig. 26. 



Shell small, rimate, cylindric-turrite, thin, glossy, hyaline; 

 spire high-turrited, the apex obtuse. Whorls 6, very slowly 

 increasing, planulate, separated by a deep, very narrowly 

 hair-line margined suture, striatulate, the striae deeply 

 curved; the last whorl slightly subangular at the periphery, 

 two-sevenths the shell's length, the base sloping. Aperture 

 oblique, the base strongly receding, suboval, angular at both 

 ends; peristome simple, acute, the upper margin straight- 

 ened, roundly protracted above, lower margin moderately 

 curved, forming a subacute angle with the columella, which 

 is lightly reflexed above over the umbilical chink. Length 5, 

 diam. 1.5, aperture 1.5 x .75 mm. (Bttg.). 



Cebu: Monte Licos (Mlldff.). 



Opeas hexagyrum BTTG., Bericht Senckenb. Ges. 1890, p. 

 248, pi. 8, f. 11. 



