▁marine ▁g ast rop od ▁m oll usk ▁in ▁the ▁family ▁Pseud om el atom idae , ▁the ▁t urr ids ▁and ▁al lies . ▁ ▁Description ▁The ▁length ▁of ▁the ▁shell ▁att ains ▁ 8 . 5   mm , ▁its ▁diameter ▁ 4   mm . ▁ ▁Distribution ▁F oss ils ▁have ▁been ▁found ▁in ▁ ▁P li oc ene ▁str ata ▁in ▁Tr in idad ▁and ▁Tob ago ; ▁age ▁range : ▁ 5 . 3 3 2 ▁to ▁ 3 . 6 ▁Ma . ▁ ▁References ▁▁ ▁W . ▁C . ▁Mans field . ▁ 1 9 2 5 . ▁Mi oc ene ▁g ast rop ods ▁and ▁sc aph op ods ▁from ▁Tr in idad , ▁British ▁West ▁Ind ies . ▁Pro ceed ings ▁of ▁the ▁United ▁States ▁National ▁Museum ▁ 6 6 ( 2 2 ): 9 1 1 6 - 9 1 2 5 ▁ ▁External ▁links ▁ ▁World wide ▁M oll usc ▁Species ▁Data ▁Base : ▁Cr ass is pi ra ▁r itan ida ▁ ▁r itan ida ▁Category : G ast rop ods ▁described ▁in ▁ 1 9 2 5 <0x0A> </s> ▁The ▁Great ▁Pot tery ▁Th row ▁Down ▁is ▁a ▁British ▁television ▁competition ▁programme ▁first ▁broadcast ▁on ▁BBC ▁Two ▁from ▁ 3 ▁November ▁ 2 0 1 5 . ▁It ▁is ▁a ▁contest ▁in ▁the ▁style ▁of ▁The ▁Great ▁British ▁B ake ▁Off ▁and ▁The ▁Great ▁British ▁S ew ing ▁Be e ▁but ▁with ▁the ▁craft ▁of ▁pot tery ▁rather ▁than ▁b aking