▁is ▁quite ▁smooth , ▁but ▁not ▁pol ished . ▁The ▁color ▁of ▁the ▁shell ▁is ▁l ivid ▁pur ple , ▁with ▁a ▁super f icial ▁was h ▁of ▁white , ▁a ▁solid ▁white ▁line ▁below ▁the ▁s uture . ▁The ▁anterior ▁extrem ity ▁of ▁the ▁col um ella ▁is ▁white . ▁The ▁call us ▁is ▁evident ▁but ▁not ▁consp ic uous . ▁ ▁This ▁very ▁peculiar ▁little ▁shell ▁is ▁of ▁a ▁solid ▁and ▁rug ged ▁aspect , ▁even ▁living ▁spec im ens ▁looking ▁as ▁if ▁beach - w orn ▁and ▁dead . ▁It ▁var ies ▁in ▁the ▁round ness ▁of ▁the ▁wh or ls ▁and ▁the ▁elev ation ▁of ▁the ▁sp ire . ▁Living ▁spec im ens ▁sometimes ▁present ▁no ▁revol ving ▁lines , ▁while ▁others ▁show ▁excess ively ▁fine ▁ones . ▁ ▁Distribution ▁This ▁marine ▁species ▁occurs ▁off ▁Green land , ▁I cel and ▁and ▁in ▁the ▁Western ▁Mediter rane an ▁Sea . ▁ ▁References ▁▁ ▁M idd endor ff ▁T . ▁A . ▁von , ▁ 1 8 4 9 ▁: ▁Beit rä ge ▁zur ▁einer ▁Mal ac oz o olog ica ▁Ross ica , ▁II . ▁Auf z ähl ung ▁und ▁Besch reibung ▁der ▁zur ▁Me eres fa una ▁Russ lands ▁gehör igen ▁Ein sch aler ▁; ▁M ém oires ▁de ▁l ' Ac adémie ▁Imp éri ale ▁des ▁Sciences ▁de ▁St - P eters bourg ▁( 6 ) ▁ 8 ▁( S ci ences ▁nature lles , ▁ 6 ): ▁ 3 2 9 – 6 1 0 ▁