icon us ▁per ar atus ▁is ▁an ▁ext inct ▁species ▁of ▁sea ▁sn ail , ▁a ▁marine ▁g ast rop od ▁m oll usk , ▁in ▁the ▁family ▁Con idae , ▁the ▁cone ▁sn ails ▁and ▁their ▁al lies . ▁ ▁The ▁variety ▁Hem icon us ▁per ar atus ▁var . ▁g ou et ensis ▁C oss mann , ▁ 1 8 9 7 ▁† ▁accepted ▁as ▁Hem icon us ▁g ou et ensis ▁C oss mann , ▁ 1 8 9 7 ▁† ▁( original ▁rank ) ▁ ▁Distribution ▁F oss ils ▁of ▁this ▁marine ▁species ▁were ▁found ▁in   France . ▁ ▁References ▁▁ ▁C oss mann , ▁M . ▁" M oll us ques ▁é oc è ni ques ▁de ▁la ▁Lo ire - in fér ie ure . ▁T ome ▁ 1 , ▁fasc . ▁ 2 ." ▁Bul letin ▁de ▁la ▁Société ▁des ▁Sciences ▁nature lles ▁de ▁l ’ O uest ▁de ▁la ▁France ▁ 6 . 4 ▁( 1 8 9 7 ): ▁ 1 8 0 - 2 4 6 . ▁ ▁Trace y ▁S ., ▁Craig ▁B ., ▁Bel li ard ▁L . ▁& ▁G ain ▁O . ▁( 2 0 1 7 ). ▁One , ▁four ▁or ▁forty ▁species ? ▁- ▁early ▁Con idae ▁( M oll us ca , ▁Gast rop oda ) ▁that ▁led ▁to ▁a ▁radiation ▁and ▁b iod iversity ▁peak ▁in ▁the ▁late ▁L ut et ian ▁E oc ene ▁of ▁the ▁Cot entin , ▁N W ▁France . ▁Car