I don't know. What do you think it's about?
Thewissen's information was published in 2001. Look up "innominate bone".
Madar, S. I., Thewissen, J. G. M. & Hussain, S. T., 2002: Additional holotype remains of Ambulocetus natans (Cetacea, Ambulocetidae), and their implications for locomotion in early whales. Journal of Vertebrate Paleontology: Vol. 22, #2, pp. 405-422
I did not include this in my original citation of the article ------>Volume 22, Issue 2 (July 2002)