1 ▁lead ▁to ▁difficulty ▁in ▁precisely ▁assess ing ▁whether ▁it ▁should ▁be ▁class ified ▁as ▁H . ▁erg aster ▁or ▁H . ▁ere ct us ▁sens u ▁str ic to . ▁As ▁such , ▁it ▁is ▁sometimes ▁considered ▁a ▁regional ▁variant ▁of ▁H . ▁ere ct us ▁sens u ▁l ato . ▁ ▁Sk ull ▁ 2 ▁▁ ▁Sk ull ▁ 2 , ▁a ▁c ran ium ▁( D 2 2 8 2 ) ▁and ▁its ▁associated ▁mand ible ▁( D 2 1 1 ), ▁was ▁discovered ▁in ▁the ▁same ▁ 1 9 9 9 ▁field ▁season ▁as ▁sk ull ▁ 1 ▁( D 2 2 8 0 ). ▁ ▁Mor ph ology ▁ ▁Sk ull ▁ 2 ▁includes ▁a ▁fairly ▁complete ▁c ran ium ▁( D 2 2 8 2 ) ▁and ▁a ▁well ▁preserved ▁mand ible ▁( D 2 1 1 ). ▁The ▁most ▁significant ▁damage ▁to ▁the ▁c ran ium ▁is ▁its ▁lack ▁of ▁fa cial ▁architecture , ▁such ▁as ▁the ▁nas al ▁b ones , ▁max ill ary ▁front al ▁processes , ▁and ▁part ▁of ▁the ▁brow ▁rid ges . ▁A ▁majority ▁of ▁the ▁c ran ial ▁base ▁is ▁missing . ▁The ▁c ran ial ▁v ault ▁was ▁subject ▁to ▁minor ▁later al ▁de formation . ▁The ▁c ran ium ▁was ▁still ▁preserved ▁well ▁enough ▁to ▁make ▁assess ments ▁about ▁its ▁c ran ial ▁capacity , ▁age , ▁and ▁sex . ▁ ▁The ▁c ran ial ▁capacity ▁of ▁Sk ull ▁ 2 ▁is ▁approximately ▁ 6 5 0 cc