adolphus ainsworth was a very old man who walked with a cane , the head of which was fashioned from the skull of the extinct ocelli carpendi , a nocturnal predator about the size of a capuchin monkey , possessing six-inch razor-sharp fangs protruding from its upper jaw and a partiality for the human eyeball ( if that of other primates was not available ) , particularly the eyes of children , which the ocelli would rip from their sockets while they slept .