IÔO M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 



Sitala H. Adams. 



i. Sitala gradata n. sp. PL IV, fig. 5. 



Shell subglobose, conoidal, gradate, rather strong for the genus, perforate, rather shining, 

 colour nearly white (perhaps by érosion, the shell being dead), whorls about 6, very convex, 

 roundedly angular at the shoulder, separated by a deep suture, sculptured with faint, nearly 

 perpendicular growth-striae. Spire rather high and acute in outline, apex acute. Aperture 

 scarcely oblique, lunate, peristome thin ; columellar margin long, straight, only a little oblique, 

 thickened, broader and reflected. above, nearly covering the narrow perforation. 



Diam. maj. 3 1 /.,, ait. 3'/ 4 , apert. ait. 2, lat. i'/ 2 mill. 



New Guinea, Resi Ridge, Aug. 30, 1907. 



The only spécimen resembles S. subglobosa Soos (Annales Musei Nationalis Hungarici, 

 Vol. II, 191 1, p. 352, fig. 8) but is smaller, though it has at least a whorl more, the whorls 

 are more convex, the suture is deeper, the shell consequently gradate, the columella nearly 

 perpendicular and longer. I see no trace of spirals. 



2. Sitala lorentzi n. sp. PI. IV, fig. 6. 



Shell conical, rounded at the base, keeled at the periphery, thin, smooth, shining, 

 subperforate, light brown, with whitish apex. Whorls nearly 6, convex, with a deep, margined 

 suture, last whorl conspicuously keeled, sculpture consisting of faint growth-striae. Aperture 

 scarcely oblique, roundedly quadrangular, peristome thin, straight, columellar margin straight, 

 nearly perpendicular, running with a rounded angle into the basai margin, thickened, its upper 

 part reflected over and nearly concealing the very narrow perforation. 



Diam. maj. 4'/ 4 . ait. 4 l / 4 , apert. ait. 2, lat. 2 mill. 



New Guinea, Resi Ridge, Aug. 30, 1907. 



Allied to 5. anthropophagoricm Hedley (Proc. Linn. Soc. N. S. W. 2 d Ser. Vol. IX, 

 1894, p. 385, PI. 24, 25, 26, fig. 1, 3, 21, 24), but smaller, higher in proportion, columella 

 higher and more perpendicular, keel fainter, no trace of spirals. 



3. Sitala fragilis n. sp. PL IV, fig. 7. 



Shell conoid, with rounded base, faintly keeled at periphery, keel visible at penulti- 

 mate whorl, just above suture, very faint near aperture; shell very thin, smooth, dull, very 

 light horn-coloured. Whorls 4'/.,, slightly convex, with a shallow suture, apex blunt. Sculpture 

 consisting of microscopic hair-lines, with faint spirals on the base, rather conspicuous near the 

 umbilical région. Aperture scarcely oblique, lunate, peristome thin, fragile, straight, columellar 

 margin concave, thickened, reflected, especially above and nearly closing a very small per- 

 foration. ^ 



Diam. maj. 4, ait. 3'/ 2 , apert. ait. 2'/ 6 , lat. 2 mill. 



New Guinea. Lorentz River, Sept. 5 — 12, 1909, Oct. 10, 1907., 



Allied to 5. propinqua Tapp. Can. (Fauna Mal. N. Guinea, Suppl. p. 41, PL I, fig. 6) 

 but whorls more convex, apex blunt, keel fainter, especially near aperture, base with spirals, 

 especially near perforation. 



