Rhiostoma macalpine woodsi Laidlaw, 1939
Laidlaw (1939) descriptions on syntype Rhiostoma macalpine-woodsi – “Shell discoidal, widely umbilicated. Colour dark brown, with irregular zigzag, radial markings of white; no definite dark band at the periphery, and with fine, close growth marks. Spire scarcely elevated, whorls 4½, increasing regularly, the last descending a little, and tending to become solute for the last 2 mm of its course. Aperture circular, not reflected nor thickened, with a notch above. On the dorsal side of this notch the margin of the peristome is produced to form an ear-like expansion, twisted backwards on itself, about 1 mm. in length, running inwards and impinging on the penultimate whorl. Suture deeply impressed. Operculum not seen.”
Rhiostoma macalpine-woodsi – “Diam. max. 12 mm., height 6 mm.” (Laidlaw, 1939)
“Sungei Siput, Perak” leg. Mr. & Mrs. Macalpine Woods (Laidlaw, 1939)