▁ ▁References ▁ ▁Category : 1 8 8 9 ▁death s ▁Category : 1 8 4 4 ▁birth s ▁Category : M embers ▁of ▁the ▁Tas man ian ▁House ▁of ▁Assembly ▁Category : 1 9 th - century ▁Australian ▁polit icians <0x0A> </s> ▁H ap lo co ch lias ▁compact us ▁is ▁a ▁species ▁of ▁sea ▁sn ail , ▁a ▁marine ▁g ast rop od ▁m oll usc ▁in ▁the ▁family ▁Sk ene idae . ▁ ▁Description ▁( Original ▁description ▁by ▁W . H . ▁D all ) ▁The ▁height ▁of ▁the ▁shell ▁att ains ▁ 2 . 3   mm , ▁its ▁diameter ▁ 2   mm . ▁The ▁small , ▁white ▁shell ▁is ▁compact ▁and ▁elev ated . ▁It ▁is ▁spir ally ▁sculpt ured ▁with ▁about ▁ 4 ½ ▁wh or ls , ▁including ▁the ▁nucle us . ▁The ▁outline ▁of ▁the ▁sp ire ▁is ▁convex ▁with ▁hardly ▁any ▁round ing ▁in ▁of ▁the ▁wh or ls ▁toward ▁the ▁s uture , ▁which ▁is ▁never theless ▁distinct ▁and ▁fin ely ▁channel led . ▁There ▁is ▁no ▁radi ating ▁sculpt ure . ▁The ▁lines ▁of ▁growth ▁are ▁not ▁ ▁visible . ▁The ▁spir al ▁sculpt ure ▁consists ▁of ▁fine , ▁close , ▁even , ▁rounded ▁threads , ▁growing ▁gradually ▁smaller ▁from ▁the ▁s uture ▁forward . ▁There ▁is ▁no ▁secondary ▁gro oving . ▁There ▁are ▁about ▁ 2 5 ▁threads ▁on ▁the ▁body ▁wh or l , ▁but ▁they ▁vary ▁in ▁number ▁and ▁strength ▁with ▁the ▁individual ▁spec imen . ▁The ▁imper