Sentence:  After dinner we all went on deck and watched the unfamiliar scenes of a Capronian night--that is, all but von Schoenvorts. There was less to see than to hear. From the great inland lake behind us came the hissing and the screaming of countless <WSD>saurians</WSD>. Above us we heard the flap of giant wings, while from the shore rose the multitudinous voices of a tropical jungle--of a warm, damp atmosphere such as must have enveloped the entire earth during the Palezoic and Mesozoic eras. 
Meaning of the word marked with <WSD> tags:  Any large reptilian animal, including crocodiles and reptilian aliens.