USILLA(Οὐσίλλα, Ptol. 4.3.10), a place in, Byzacium in Africa Proper. It is the Usula of the Itin. Ant. (p. 59), lying between Thysdrus and Thenae. Variously identified with Inchillaor Sidi Makelouf, and Inshillah. [T.H.D]