. ▁The ▁body ▁wh or l ▁scarcely ▁desc ends ▁anterior ly , ▁above ▁with ▁ 6 ▁to ▁ 8 ▁spir al ▁closely ▁gran ose ▁c ing uli , ▁beneath ▁with ▁ 7 ▁to ▁ 9 ▁similar ▁concent ric ▁c ing uli . ▁The ▁inter st ices ▁both ▁above ▁and ▁below ▁are ▁closely , ▁sharp ly , ▁ob liqu ely , ▁micro scop ically ▁stri ate . ▁The ▁base ▁of ▁the ▁shell ▁is ▁slightly ▁convex . ▁The ▁ob lique ▁a pert ure ▁is ▁t et rag onal . ▁The ▁outer ▁lip ▁is ▁four ▁or ▁five - l ir ate ▁within , ▁the ▁upper ▁fol d ▁somewhat ▁en larg ed ▁and ▁sub dent iform . ▁The ▁bas al ▁margin ▁and ▁marg inal ▁rib ▁of ▁the ▁um bil icus ▁is ▁fin ely ▁p licate . ▁The ▁col um ella ▁is ▁ob lique , ▁nearly ▁straight , ▁its ▁edge ▁ref lex ed ▁and ▁p licate - dent ate , ▁termin ating ▁below ▁in ▁a ▁small ▁square ▁dent icle , ▁inserted ▁above ▁upon ▁the ▁side ▁of ▁the ▁um bil icus . ▁The ▁um bil icus ▁is ▁ ▁rather ▁wide ▁and ▁fun nel - sh aped . ▁ ▁Distribution ▁This ▁marine ▁species ▁is ▁en demic ▁to ▁Australia ▁and ▁occurs ▁off ▁South ▁Australia , ▁Tas mania , ▁Victoria ▁and ▁Western ▁Australia . ▁ ▁References ▁▁ ▁Philipp i , ▁R . A . ▁ 1 8 4 9 . ▁Cent uria ▁al tera ▁Test ace orum ▁nov orum . ▁Zeitschrift ▁für ▁Mal ak oz o ologie ▁ 5 : ▁ 9