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Vitellogenesis and placental transfer both contribute substantially to embryonic nutrition in the viviparous scincid lizard Pseudemoiaentrecasteauxii. Neonatal wet mass was 396% greater than egg wet mass and neonatal dry mass was 168% greater than egg dry mass. We estimate that 49% of the organic molecules for embryonic growth and metabolism were provided by placental nourishment. This pattern of embryonic nutrition, in which ovarian and uterine contributions are approximately equivalent, has not been reported previously for reptiles. Female Bassiana duperreyi, a closely related oviparous species, produced larger clutches of larger eggs. Although there was a great disparity in egg mass between these two species, differences in newborn composition were less pronounced. Mean dry mass, adjusted for female size, of B. duperreyi eggs was 135% greater than mean dry mass of P. entrecasteauxii …