In the previous papers concerned with the fetal dentition of the fur seal, the author described that the deciduous teeth are very small and are simple in shape and that they have completely shed during the period of the intra-uterine life (’61a, b). The mammalian deciduous tooth has not been studied yet in detail except for that of the human and some animals (Diff rich,’60), but the permanent tooth has been widely investigated by many workers (Owen, 1840-45; Terra, ’11; Mummery,’24; Colyer, '36; Wiclcloson,’39; Scheffer,’51, ’60; Chaison,’57; Fujita, '57; Scott and Symons, ’61; etc.).
抄録全体を表示