The sizes of the largest bones found such as humeri and femora were compared. The limb shortening is fundamentally confined to the proximal limb segments i.e. Femurs and humeri. The humeri are robust, about long, with very expanded distal and proximal ends. The humeri do not have a free medullary cavity. It contains six vertebrae, the coracoids, the humeri, a right radius and three spines. The head ("caput humeri"), is nearly hemispherical in form. Their humeri, upper arm bones, had a large deltopectoral crest. The humeri of "Zygorhiza" and "Chrysocetus" are more gracile than those of "Dorudon". Both arms are preserved naturally articulated, but the humeri of both are only partially preserved. It cannot be compared with other genera that lack preserved humeri. Both humeri from the known material are poorly preserved, but show primitive characters. It had "type II" retroarticular process and proportionally shorter humeri than "P. funkei". Like the humeri, the radius is slender, and lacks large expansions on either end. The humeri were slender and lightly built, and almost totally straight.