174 OPEAS, EAST INDIES. 



Nachriehtsblatt. D. Malak. Ges. 1891, p. 179, 180. ? Opeas 

 pyrgula A. ADAMS, Ann. Mag. N. H. 1868, i, p. 459 (nude 

 name; no locality). MLLDFF., Journ. As. Soc. Beng. liv., pt. 

 2, 1885, p. 61 (no description). 



The shell is very narrow. The last two or three whorls 

 are much flattened, only slightly convex, but parted by deep 

 sutures which are more or less crenulated in places by short 

 slender striae below them, the rest of the surface being only 

 rather weakly wrinkle-striate. The columella is concave, 

 widely reflexed above. The outer lip is only very weakly 

 arched forward. Specimens measure: 



Length 9, diam. 2.1, aperture 2.3 mm., whorls iy 2 . Hirado. 



Length 7, diam. 2, aperture 2 mm., whorls 7. Mino. 



Well distinguished by its -club-like shape, narrower than. 

 Opeas gracile, and by the deep, weakly crenulate suture, 

 separating somewhat flattened whorls. The aperture 

 is longer than in related forms. Fig. 8 is from Kashima, 

 Harima; figs. 9 and 10 from Chichijima (Peel Island), in 

 the Bonin group. 



IX. East Indian species: Sumatra, Java, Celebes and the 

 Moluccas, etc.; New Caledonia. 



Opeas gracile occurs throughout this region, and 0. javani- 

 cum is widely distributed in the northern islands. 



72. 0. DENSESPIEATUM (Mousson) . 



Shell subumbilicate, shortly turrite, rudely and irregularly 

 transversely striate, the striae oblique and straight, and 

 marked with other very minute, interrupted, decussating 

 strise, covered with a pale, opaque cuticle. Spire truncate- 

 involute, rather acute; suture much impressed. Whorls 7%, 

 convex, the last one-third the length of the spire, tapering. 

 Aperture oblique, long-ovate; peristome unexpanded, acute; 

 outer margin straight, rather remote above, basal regularly 

 arcuate, columellar long, straight, widely reflexed over the 

 narrow umbilicus, Length 18, diam. 6.5 mm. (Mouss.) 



Java: near Buitenzorg, very rare (Zollinger). 



Bulimus densespiratus Mouss., Journ. de Conchyl. 1857, 



