idae . ▁ ▁Description ▁The ▁height ▁of ▁the ▁shell ▁att ains ▁ 1 1   mm . ▁This ▁sh ining ▁shell ▁with ▁red ▁sp ots ▁has ▁a ▁de pressed - orb icular ▁shape ▁and ▁is ▁smooth ▁below . ▁The ▁grad ate , ▁con ical ▁sp ire ▁has ▁an ▁ac ute ▁a pe x . ▁It ▁contains ▁ 6 ½ ▁wh or ls ▁with ▁spir ally ▁gran ulated ▁li ra e . ▁The ▁body ▁wh or l ▁has ▁a ▁de pressed ▁rot und ▁shape . ▁On ▁top ▁it ▁shows ▁an ▁angle , ▁below ▁it ▁is ▁rot und . ▁The ▁body ▁wh or l ▁contains ▁seven ▁li ra e , ▁the ▁upper ▁ones ▁gran ulated , ▁the ▁others ▁plane . ▁The ▁shell ▁has ▁a ▁wide ▁and ▁deep ▁um bil icus .. ▁It ▁contains ▁seven ▁rid ges ▁above ▁the ▁peri ph ery , ▁the ▁upper ▁rid ges ▁being ▁be aded . ▁The ▁base ▁of ▁the ▁shell ▁is ▁convex . ▁The ▁a pert ure ▁is ▁slightly ▁ob lique ▁and ▁sub quad rate . ▁The ▁ob lique ▁col um ella ▁has ▁a ▁slight ▁call us . ▁ ▁Distribution ▁This ▁species ▁occurs ▁in ▁the ▁Indian ▁Ocean ▁off ▁Mad agas car ▁and ▁off ▁K wa Z ulu N atal , ▁South ▁Africa . ▁ ▁References ▁▁ ▁Herbert ▁D . G . ▁( 1 9 9 2 ). ▁Re vision ▁of ▁the ▁Um b oni inae ▁( M oll us ca : ▁Pro sob ranch ia : ▁Tro ch idae ) ▁in ▁southern ▁Africa ▁and ▁Moz amb ique . ▁Ann als