The burrow of a jerboa, Jaculus jaculus loftusi Blanford, excavated near Samarra in Iraq on December 16, 1954, contained an adult female with four infants in the nest chamber. The four infants were just under 100 mm. in length and must have been recently born, the eyes as yet unopened and the skin partly naked. They were almost helpless, making feeble crawling movements only and uttering plaintive squeaking cries. As the mother was almost moribund when received it was clearly impossible to rear these interesting infants and two of them were preserved for study. Certain features of these neonatal jerboas seem worthy of note. The hind feet are already disproportionately enlarged and there is no trace of the two lost digits on them. The tail is surprisingly short, not so long as the head and body, and it already bears a short white tuft terminally....