form the iliac arteries, each of which passes obliquely outward and backward to the base of the corresponding thigh to become continuous with the sciatic artery. The course of the latter is essentially similar to that in Rana, and peroneal and tibial arteries are formed at the knee in similar fashion. As the tibio-fibula is not perforated in Leiopelma, however, the main tibial artery curves around the bone instead of passing through it as in Rana.