of the very different pelvis of Apatornis are represented in Fig. 389. In Fig. 390 the outlines of these two co-ordinate systems are superposed upon one another, and those of three intermediate and equidistant co-ordinate systems are interpolated between them. From each of these latter systems, so determined by direct interpolation, a complete co-ordinate diagram is drawn, and the corôÙreôÙsponôÙding outline of a pelvis is found from each of
these systems of co-ordinates, as in Figs. 391, 392. Finally, in Fig.