Amphibians (2)

Amphibians is a series of science fiction novels by S. Fowler Wright. He originally intended to write a trilogy but only completed two novels. • The Amphibians (1925) • The World Below (1929) In 2009, Brian Stableford wrote a sequel novel titled The World Beyond: Being a Sequel to S. Fowler Wright's Classic Science Fiction Novel, "The World Below"