National Geographic : 1942 Feb
o National Geographic Society Painting byCharles R.Knight Fantastic, Scorpionlike Eurypterids, Some Eight Feet Long, Spent Most of TheirTime Half Buried inMud The clumsy creatures lived under water and crawled sluggishly about in search of food. Their skins were coveredwith ahorny substance dotted with scalelike mark ings. Eurypterids lived in the remote Age of Fishes. Much like them today is the familiar king, or horseshoe crab, with astinglike spine atthe end ofitsbody.