▁the ▁long ▁axis ▁orient ed ▁side ways . ▁The ▁del to pect oral ▁cr est , ▁which ▁is ▁located ▁on ▁the ▁front ▁surface ▁near ▁the ▁top ▁end ▁of ▁the ▁b one , ▁is ▁very ▁prominent , ▁and ▁be ars ▁a ▁hook - like ▁process ▁about ▁ ▁of ▁the ▁way ▁down ▁its ▁length . ▁It ▁extends ▁down wards ▁to ▁the ▁mid sh aft ▁of ▁the ▁b one , ▁and ▁side ways ▁so ▁that ▁it ▁occup ies ▁the ▁outer ▁ ▁of ▁the ▁b one ' s ▁width . ▁In ▁O pis th oco el ica ud ia , ▁the ▁cr est ▁is ▁wider , ▁occup ying ▁ ▁of ▁the ▁b one ' s ▁width . ▁The ▁hum er us ▁forms ▁a ▁wide ▁de pression ▁on ▁the ▁portion ▁of ▁the ▁sh aft ▁further ▁in ward ▁than ▁the ▁cr est . ▁ ▁Near ▁the ▁top ▁end ▁on ▁the ▁back ▁of ▁the ▁b one , ▁there ▁are ▁two ▁de press ions ▁border ing ▁a ▁central ▁r idge , ▁which ▁extends ▁up wards ▁to ▁support ▁the ▁rounded ▁hum eral ▁head . ▁On ▁the ▁bottom ▁of ▁the ▁b one , ▁the ▁two ▁cond yles ▁that ▁art ic ulate ▁respectively ▁with ▁the ▁radius ▁and ▁ul na ▁are ▁separated ▁by ▁a ▁broad ▁but ▁shall ow ▁inter cond yl ar ▁gro ove , ▁and ▁there ▁is ▁a ▁low ▁but ▁robust ▁r idge ▁on ▁either ▁side ▁of ▁the ▁gro ove . ▁These ▁structures ▁are ▁more ▁prominent ▁in ▁Salt as aur us ▁and ▁O pis th oco el ica ud ia . ▁The ▁cond yles