[Ultrastructural characteristics of several constituants of limb buds in the embryos of the slowworm (Anguis fragilis L.) and the green lizard (Lacerta viridis Laur.)].

Ultrastructural characteristics of the cells of the apical crest, of the mesoblast and of the ventral processes of somites, in the anlage of the anterior limb buds of embryos of the slow-worm (Anguis fragilis) and of the green lizard (Lacerta viridis) are described at early stages of the development. Differences between the two species studied are brought to light.