In which the party suffers from the venomous wounds inflicted by unknown beasts and endures a harrowing nocturnal visit from a monstrous predator, prompting vigilant watches and profound considerations of the terrible creatures that inhabit this prehistoric land. An inspired ascent of a towering gingko reveals a vast, mysterious landscape punctuated by startling discoveries, including a furtive ape-man, culminating in the drafting of the first tentative map of the Lost World and the christening of its central lake.