On either view we must suppose that the bizcacha has retained, by inheritance, more of the character of its ancient progenitor than have other Rodents; and therefore it will not be specially related to any one existing Marsupial, but indirectly to all or nearly all Marsupials, from having partially retained the character of their common progenitor, or of some early member of the group.

On the other hand, of all Marsupials, as Mr.

Waterhouse has remarked, the Phascolomys resembles most nearly, not any one species, but the general order of Rodents.