MUIRHEAD'S MYSTERIES: Tell me about this Japanese turtle

I took this photo in Whitby Library towards the end of September 2012. It was in their Asian ethnographical cabinet. The plaque accompanying the drawing, in a Japanese natural history book,says,if you cannot read it:” Book of Natural History from Japan. Dated  Spring in the First Year of Genji (1864) Gift of H.P. Kendall in 1955   WHITM : ETH 63.”

I did a cursory Google research on this attractively coloured tortoise or turtle but so far have found no indication as to its identity. It could be nothing new to science at all, I just don`t know. Do you? - Dr Devo