Roughly 400 million years ago, scorpions the size of small alligators roamed our oceans. With their powerful claws and thick exoskeletons, these 2.5m-long predators dominated their world. Until ...

Encyclopedia Prehistorica: Sharks and Other Sea Monsters By Robert Sabuda and Matthew Reinhart Candlewick, $27.99 Ages 8-12 years “Here there be monsters,” a phrase from ancient maps, c… ...

Pterygotus was an enormous sea scorpion, one of the largest arthropods to have ever existed, reaching lengths of up to 8 feet. It lived in the ancient oceans, where it was an apex predator.

American Journal of Science, May.—Observations on the derivation and homologies of some Articulates, by James D. Dana. It is probable that all Articulates are successional to the Rotifers. There ...