Here's a site with a photo of the best skeleton recovered so far.
http://darla.neoucom.edu/DEPTS/ANAT/The ... cetid.html
Read the accompanying text to see why it is thought that the animal was often aquatic, although it was clearly also able to walk about on land.
There is a much better skull from another find, which you can see here. It was thought to be a primitive whale, because the ear, teeth, nostrils, etc, are all very much like the archocetes (primitive whales). Only after they found the skull attached to the body of an ungulate, did they realize the transitional nature of the beast.