Drawing depicting: Dendrolagus inustus -- Grizzled Tree-kangaroo [Brown tree-kangaroo], It doesn't look like Richter's usual style, but since Gould writes in the text that the drawing "was made by Mr. Richter, in the [Zoological] Society's Gardens" it may well be that working ab initio would lead to a less usual style., A fairly finished study of the animal, with a much smaller sketch of another. The main published figure follows the present form very closely; ". . . Not nearly the size of life"