OPE AS, PHILIPPINE IS. 



"No similar small slender blunt-spired forms are known 

 to me in this genus." (Bttg.). It resembles 0. pyrgula 

 very closely in shape, but is smaller and a little more deeply 

 striate. 



87. 0. NITIDUM Quadras et Moellendorff. 



Shell rimate, slenderly fusiform, thin, pellucid, very lightly 

 striatulate, very glossy, yellowish; spire gradually tapering, 

 the apex obtuse. Whorls 6%, planulate, separated by a very 

 deeply impressed, submarginate, subcrenulate suture. Aper- 

 ture nearly vertical, roundly rhomboidal; peristome thin, 

 acute, the outer margin strongly arched forward; columellar 

 margin dilated above, reflexed. Length 6.5, diam. 2 mm. 

 (ttttdff.). 



Northern Luzon: villages of Lallo and Sanchez Mira 

 (Quadras). 



Opeas nitidum Q. & M., Nachrbl. d. Mai. Ges. Nov.-Dec. 

 1893, p. 177. 



88. O. SUBCRENULATUM Moellendorff. 



Shell rimate, slenderly subfusiform, thin, subpellucid, very 

 closely but distinctly striatulate, silky, pale-yellowish. Spire 

 gradually tapering, slender, the apex obtuse. Whorls 9%, 

 a little convex, flattened in the middle, more distinctly striate 

 at the deeply impressed suture. Aperture a little oblique, 

 rounded-rhomboidal, the peristome unexpanded, acute; colu- 

 mellar margin reflexed, appressed. Light 11.5, diam. 3 mm. 

 (Mlldff.). 



Caramuan, Camarines province. 



Opeas subcrenulatum Mlldff., Nachrbl. d. Mai. Ges. xxvii, 

 July-Aug. 1895, p. 118. 



89. 0. PRUINOSUM Moellendorff. 



Shell slightly rimate, a little ventricosely turrite, 'covered 

 with very short and very deciduous membranous scales; 

 silky, pale grayish-straw colored. Spire turrite, with slightly 

 convex sides, the apex rather obtuse, whorls 9, a little con- 

 vex, separated by a rather deep suture. Aperture vertical, 



