20. Discartemon collingei (Sykes, 1902) Figs 8H, 23

Streptaxis collingei Sykes, 1902: 22, 60, pl. 3, figs 8-10. Type locality: Kelantan, Malay Peninsula. Gude 1903: 214. Laidlaw 1933: 233.

Streptaxis (Discartemon) collingei - Möllendorff 1902: 136.

Odontartemon (Discartemon) collingei - Laidlaw 1929: 260.

Discartemon collingei - Benthem Jutting 1954: 79, 83, fig. 4. Benthem Jutting 1959: 168. Berry 1965: 28, 29. Richardson 1988: 182. Maassen 2001: 87. Marwoto 2008: 192.

Material examined.

Syntype NHMUK 1937.7.9.20 (1 shell; Fig. 8H). Kelantan, Malaysia: NMW 1955.158.25250 (2 shells). Kelantan, Malaysia: NHMW 40716 (1 shell).

Remarks.

Shell globose-heliciform, translucent, with a conical spire with a distinct suture. Shell surface with transverse ridges that diminish below periphery; varices present. Later whorls slightly axially deflected. Last whorl shouldered and regularly expanded; umbilicus wide and deep. Aperture sub-quadrangular; peristome thick, expanded and reflected. Apertural dentition with one parietal, one palatal, one basal and one columellar lamella (Fig. 8H).

Discartemon collingei is similar to Discartemon lemyrei, but the latter species has a larger shell with a higher spire, a shell surface with transverse ridges, the last whorl rounded and more inflated, a narrower umbilicus, and only one parietal lamella.