Radius of a Hexaprotodon sivalensis.
Hexaprotodon is a species of Hippopotamidae that is sometimes refered to as the pygmy hippo. The name Hexaprotodon means "six front teeth" as some of the fossil forms have three pairs of incisors.
The species Hexaprotodon also includes a number of rarely studied extinct species from Asia, sometimes labeled "Asian Hippopotami.
The piece is as found in its original state with lava residue.