▁previous ▁population ▁of ▁this ▁animal ▁is ▁unknown ▁because ▁only ▁one ▁spec imen ▁has ▁been ▁preserved , ▁which ▁is ▁currently ▁hous ed ▁in ▁the ▁Natural ▁History ▁Museum , ▁London . ▁No ▁record ▁of ▁St ur de e ' s ▁pip ist rel le ▁has ▁been ▁observed ▁over ▁the ▁last ▁hundred ▁years . ▁ ▁References ▁ ▁Category : P ip ist rell us ▁Category : M amm als ▁described ▁in ▁ 1 9 1 5 ▁Category : T ax a ▁named ▁by ▁Old field ▁Thomas ▁Category : B ats ▁of ▁Asia ▁Category : End em ic ▁fa una ▁of ▁Japan ▁Category : M amm als ▁of ▁Japan ▁Category : N atural ▁history ▁of ▁the ▁Bon in ▁Islands ▁Category : Ext inct ▁animals ▁of ▁Japan <0x0A> </s> ▁An ▁e quest rian ▁st air case ▁or ▁rid ers ' ▁st air case ▁is ▁a ▁very ▁g ently ▁s lop ing ▁flight ▁of ▁steps ▁that ▁can ▁be ▁negoti ated ▁by ▁horses . ▁Its ▁orig ins ▁may ▁be ▁seen ▁in ▁the ▁m ule ▁st air cases ▁in ▁ste ep ▁terrain ▁in ▁open ▁country . ▁ ▁Use ▁in ▁interior ▁rooms ▁ ▁Its ▁design ▁principles ▁found ▁their ▁way ▁from ▁road ▁construction ▁into ▁building ▁architecture . ▁Here ▁an ▁e quest rian ▁st air case ▁was ▁a ▁spir al , ▁cur ved ▁or ▁repeatedly ▁interrupted ▁r amp ▁within ▁buildings , ▁that ▁had ▁a ▁g ently ▁s loped ▁and ▁a ▁non - s lip ▁floor , ▁either ▁smooth ▁or ▁frequently ▁divided ▁by ▁trans verse ▁rid ges . ▁This ▁type ▁of ▁r amp ▁occurs ▁in