Georissa scalinella (Van Benthem Jutting, 1966)
Benthem-Jutting (1966) original descriptions on Hydrocena scalinella – “Shell small, not very glossy and scarcely transparent, low-turbinate, with 3 ¼ rapidly increasing turreted whorls. Upper whorls reddish, lower ones reddish-yellow. Embryonic whorl smooth, subsequent whorls with distinct spiral lirae above and below the periphery, which is sharply carinate. The peripheral keel is accentuated by numerous white, triangular scales or flutings. A few other spiral ridges are also provided with scales, but these are less strongly developed. Growth lines weaker than the spiral ridges. Whorls flats-or nearly so-above the peripheral keel, vertical below it, and finally more rounded towards the umbilicus. Suture well marked, somewhat canaliculated in some specimens. Apex rounded, smooth, a little inflated; base at first convex, then concave towards the wide umbilical region. Umbilicus closed by a broad, polished callus. Aperture semicircular, oblique, interior yellow to yellowish-orange. Peristome not continuous; parietal side occupied by the umbilical callus; outer lip sharp, not reflected. Operculum semicircular, calcareous, light-yellow in colour; nucleus eccentric. From the internal surface a short, calcareous peg extends behind the parietal edge of the aperture.”
Hydrocena scalinella – “Dimensions: Height 1.6-2.0 mm; Maximum diameter 1.4-1.6 mm; Height of aperture 0.7-0.9 mm.” (Benthem-Jutting, 1966)
Type locality – “Lahad Datu Caves on Teck Guan Estate, Sabah” leg. Saul/Aug. 18, 1964 (Benthem-Jutting, 1966)