This is the first study on the ultrastructure of the eggshells of the green turtles Chelonia mydas in Oman Eggs of green sea turtles, Chelonia mydas were collected from Ras Al-Hadd. Eggshells were taken from freshly oviposited eggs and from eggs soon after hatching. Samples were cleaned and cut into small pieces. Some eggshells were examined under low vacuum condition (untreated) and viewed with back scattered electron detector (BSE) at 20kV and 20 Pa vacuum pressure using JEOL JSM-5600LV, SEM. Others were examined under high vacuum condition after being gold coated (BioRad SEM Sputter coater) using JSM-5600LV, SEM and viewed with secondary electron detector (SE) at 5kV.