[Phantasm]

Originally Posted by Icelander

Incidentally, what seem like the best land-based dino-mounts, to replace horses in a pulp Lost World?

I'd go with Ceratopsians, from the pony-sized Protoceratops through the classic ox-sized Triceratops, and theropods such as the Utahraptor. While Ceratopsians would look cool, they likely lack speed, being more akin to riding an elephant than a horse. Theropods are faster, built for running, but being carnivores likely require a heavy animal protein rich diet, which calls for more bronto meat (and other large herbivores) to be farmed to support the raptors.