ological ▁sites ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Illinois ▁Category : National ▁Historic ▁Land marks ▁in ▁Illinois ▁Category : National ▁Register ▁of ▁Historic ▁Places ▁in ▁Rand olph ▁County , ▁Illinois ▁Category : Ge ography ▁of ▁Rand olph ▁County , ▁Illinois ▁Category : R ock ▁sh el ters ▁in ▁the ▁United ▁States <0x0A> </s> ▁S pl end r ill ia ▁ch ath am ensis ▁is ▁a ▁species ▁of ▁sea ▁sn ail , ▁a ▁marine ▁g ast rop od ▁m oll usk ▁in ▁the ▁family ▁Dr illi idae . ▁ ▁Description ▁The ▁length ▁of ▁the ▁shell ▁att ains ▁ 1 0 . 5   mm , ▁its ▁diameter ▁ 4 . 3   mm . ▁ ▁Distribution ▁S . ▁ch ath am ensis ▁can ▁be ▁found ▁in ▁the ▁waters ▁surrounding ▁the ▁Western ▁Ch ath am ▁R ise , ▁New ▁Zealand . ▁at ▁a ▁depth ▁of ▁ 8 5 0 ▁m . ▁ ▁References ▁▁▁ ▁T ucker , ▁J . K . ▁ 2 0 0 4 ▁Catalog ▁of ▁recent ▁and ▁foss il ▁t urr ids ▁( M oll us ca : ▁Gast rop oda ). ▁Z oot ax a ▁ 6 8 2 : 1 - 1 2 9 5 . ▁ ▁External ▁links ▁ ▁ch ath am ensis ▁Category : G ast rop ods ▁of ▁New ▁Zealand ▁Category : G ast rop ods ▁described ▁in ▁ 1 9 8 9 <0x0A> </s> ▁William ▁Louis ▁" D utch " ▁Hin rich s ▁( A pril ▁ 2 7 , ▁ 1 8 8