▁sea ▁sn ails , ▁marine ▁g ast rop od ▁m oll us ks ▁in ▁the ▁family ▁Tro ch idae , ▁the ▁top ▁sn ails . ▁ ▁Description ▁The ▁shell ▁has ▁an ▁elev ated - con ic ▁shape . ▁The ▁col um ella ▁is ▁c ren ulate , ▁not ▁to oth ed . ▁The ▁um bil icus ▁is ▁narrow ▁without ▁spir al ▁fun icle . ▁ ▁Species ▁Species ▁within ▁the ▁genus ▁Pri ot ro chus ▁include : ▁ ▁Pri ot ro chus ▁an ies ae ▁M ool en be ek ▁& ▁De k ker , ▁ 1 9 9 2 ▁ ▁Pri ot ro chus ▁g oud oti ▁( F ischer , ▁ 1 8 7 8 ) ▁ ▁Pri ot ro chus ▁ir is ▁Herbert , ▁ 1 9 8 8 ▁ ▁Pri ot ro chus ▁kot sch yi ▁( Ph ili ppi , ▁ 1 8 4 9 ) ▁ ▁Pri ot ro chus ▁obsc urus ▁( W . ▁Wood , ▁ 1 8 2 8 ) ▁Species ▁brought ▁into ▁syn onym y ▁ ▁Pri ot ro chus ▁a lex and ri ▁Tom lin , ▁ 1 9 2 6 : ▁syn onym ▁of ▁Pri ot ro chus ▁obsc urus ▁p ons on by i ▁( G . ▁B . ▁S ower by , ▁ 1 8 8 8 ) ▁ ▁Pri ot ro chus ▁ch ry sol a em us ▁( Mart ens , ▁ 1 8 8 0 ): ▁syn onym ▁of ▁Pri ot ro chus ▁g oud oti ▁(