Who is Erasmus Gray from The Monstrumologist and what is their importance?

Erasmus Gray is a grave robber who initially finds the impregnated body of Eliza Bunton, a young woman who died, and into whose dead body was placed the Anthropophagi fetus. The Anthropophagi cannot give birth, and thus their eggs are deposited into the corpses of humans. In this case, Gray was attempting to rob the grave, when he found a dead Anthropophagi attached to the body.