There is an image of this cultivar on the Hosta Library. From the photo on the HL website, it appears to be a small to medium size hosta with yellowish colored leaves. This non-registered cultivar was originated in Japan. 

An article by W. George Schmid in The Hosta Journal  (1996 Vol. 27 No. 2) states that the correct name is Hosta hypoleuca 'Ogon Urajiro'.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term urajiro as white-backed or white underside and the term ogon or oogon as gold or yellow.