For a discussion of bixi, the mythical beast with the head of a dragon, the tail of a qilin, the paws of a buddhistic lion, and the body of a tortoise, see the footnote to lot 1179.
A very similar bottle in white jade is illustrated by H. Moss, V. Graham and K.B. Tsang, A Treasury of Chinese Snuff Bottles, The Mary and George Bloch Collection, vol. 1, Jade, Hong Kong, 1995, pp. 130-1, no. 51, where it is dated 1730-1850.