Fig. 13 Jaminia corrugata: Preston 1912: 71, fig. 4 (Victoria Falls; 2.25×1.00 mm).

A single, heavily worn shell found on Cabo Delgado.Previously recorded from the area near the type locality. There is also a single shell in the Natal Museum (L6653) collected on 19 February 1963 by A.C. and W.H. van Bruggen in the forest east of Gôndola in Central Mozambique. Characteristic strong corrugation (of the periostracum) can be observed only on fresh shells, and “a small, rather indistinct basal denticle situated well within and rather on the right-hand side of the shell” (Preston 1912: 71) can be missing (Pilsbry & Cooke 1920: 362, pl. 34, fig. 15). The shell from Cabo Delgado has just barely noticeable thickening in place of the lower palatal tooth, with a corresponding slight indentation on the outer surface of the last whorl. N. corrugata has a stronger corrugated periostracum and is proportionally higher than the preceding species.