Abstract
ber 9 to October 15, eight females delivered 13 dead young and three delivered five weak ones. In order to determine the possible cause of fetal death, five gravid females were sacrificed on October 15. In each one, two fully developed young were found dead within the oviducts. Two remaining gravid animals delivered dead young on October 22, and October 27, 1952. Thus, one may conjecture that if the young of Xantusia vigilis are retained in utero beyond a certain period, they will expire and probably be expulsed within a month. The cause of fetal death is possibly due in part to the inability of an aging placenta to meet the increasing oxygen demand of a growing organism and failure of excretory mechanisms. The abnormal conditions of the laboratory probably account for oviducal retenti of young, as it is presumably a rar occurrence in nature.
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