Abstract
Some osteological features of the kinetic system in the skull of Anilius scytale and Cylindrophis rufus are described showing a marked divergence of the two species. Cylindrophis is more specialized in showing a more rigid structure as an adaption to the burrowing habits of the snake. Some aspects of the new prokinetic joint of snakes, lying between the frontals and the nasals rather than between the frontals and the parietals as the mesokinetic joint in lizards, are discussed.