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NGC 4194 is a post-merger starburst known as The Medusa for its strikingtidal features. We present here a detailed study of the structure andkinematics of ionized gas in the central 0.65 kpc of the Medusa. The datainclude radio continuum maps with resolution up to $0.18\arcsec$ (35 pc) and a$12.8\mu$m [NeII] data cube with spectral resolution $\sim4$\kms: the first{\it high resolution, extinction-free} observations of this remarkable object.The ionized gas has the kinematic signature of a core in solid-body rotation.The starburst has formed a complex of bright compact \HII~regions, probablyexcited by deeply embedded super star clusters, but none of these sources is aconvincing candidate for a galactic nucleus. The nuclei of the merger partnersthat created the Medusa have not yet been identified.

Ionized Gas Kinematics at High Resolution IV: Star Formation and a Rotating Core in the Medusa (NGC 4194)