Ptychopatula dioscoricola (C. B. Adams, 1845) Figure 45A

Helix dioscoricola C. B. Adams, 1845: 16.

Type locality.

“Jamaica” .

Material examined.

Gunung Doya: ME 8942, ME 8997. Gunung Kapor: ME 8151, ME 8502, ME 9006, ME 9027, ME 9070. Kampung Padang Pan: ME 6830. Lobang Angin: ME 9140, ME 9173.

Distribution in Borneo.

Sarawak: Kuching, Bintulu, Miri, and Limbang divisions. Sabah: Sandakan Division. Distribution elsewhere. Circumtropical (Pilsbry 1920-1921).

Remarks.

Only dry shells were found during the surveys. It differs from P. circumlitum (Hedley, 1897) and P. orcella (Stoliczka, 1873) in having a higher spired shell with an umbilicus that is partly or entirely covered by the reflected peristome. This species also differs from P. pulvisculum (Issel, 1874) in having a larger shell with spiral lirae on shell surfaces.