▁b one , ▁which ▁is ▁short ▁and ▁deep , ▁but ▁is ▁broken ▁along ▁a ▁vertical ▁f ract ure ▁behind ▁the ▁to oth row . ▁There ▁is ▁another ▁f ract ure ▁in ▁the ▁front ▁part ▁of ▁the ▁j aw . ▁The ▁b one ▁is ▁ 1 9 . 5   mm ▁( 0 . 7 7 ▁in ) ▁long ▁and ▁ 1 1 . 4   mm ▁( 0 . 4 5 ▁in ) ▁deep . ▁All ▁the ▁teeth ▁are ▁incomplete ▁or ▁absent , ▁and ▁lack ▁both ▁en am el ▁and ▁c ement um , ▁but ▁what ▁remains ▁indicates ▁that ▁there ▁was ▁a ▁large ▁in cis or ▁at ▁the ▁front ▁and ▁five ▁che ek te eth ▁further ▁back , ▁separated ▁by ▁a ▁di ast ema ▁( g ap ) ▁of ▁about ▁ 2 . 5   mm ▁( 0 . 0 9 8 ▁in ). ▁On ▁the ▁lab ial ▁( outer ) ▁surface ▁of ▁the ▁dent ary , ▁there ▁is ▁one ▁large ▁mental ▁for amen ▁( open ing ). ▁The ▁mand ib ular ▁sym ph ysis , ▁where ▁the ▁two ▁hal ves ▁of ▁the ▁lower ▁j aw ▁meet , ▁is ▁poor ly ▁preserved , ▁but ▁there ▁is ▁nothing ▁to ▁suggest ▁that ▁the ▁left ▁and ▁right ▁dent aries ▁were ▁f used . ▁The ▁lower ▁margin ▁of ▁the ▁b one ▁is ▁convex ▁at ▁the ▁front , ▁but ▁con ca ve ▁further ▁back , ▁so ▁that ▁the ▁depth ▁of ▁the ▁dent ary ▁is ▁ 8 . 3   mm ▁( 0 . 3 3 ▁in ) ▁below