Centaur 

Centaur:  A figure human above the waist with, below, the body of all four legs of a horse, is known in the Kassite and Middle Assyrian Periods on seals and sealings and on kudurrus.  It also occurs on Babylonian stamp-seals of Hellenistic date.  Sometimes it has the tail of a scorpion.  The human part is often shown armed with a bow or club, hunting other animals.  In the Hellenistic Period the creature represents the god Pabilsag.

Resource List - all entries are taken verbatim from the original source:

(r) "Gods, Demons, and Symbols of Ancient Mesopotamia.  An Illustrated Dictionary."  Jeremy Black and Anthony Green.  University of Texas Press, Austin.  ©1992