This is a cup or bowl in the shape of an imaginary marsupial called the slobber, Reteostium cortepellium. It comes from After Man: A Zoology of the Future by Dougal Dixon, which speculates on the evolution of animal lifeforms on earth fifty million years after the extinction of human beings.
The slobber is a sloth-like marsupial which captures its prey in the sticky strands of mucus secreted from its mouth.
The slobber is blind, but its vestigial eyes are still present behind the algae-colored fur.
Top view of the slobber cup.
The illustration of the slobber from After Man.