no EXTINCT MONSTERS. 



Evolutionist of to-day leads the doubting brother across tlie 

 shallow remnant of the gulf, once thought impassable."^ 



We now pass on to describe two of the strangest and most 

 wonderful of all the Dinosaurs, recently discovered in the far 

 West. The first of these is the Stegosaurus,'^ or plated lizard, 

 not wholly unknown before, because part of its skeleton was 

 found some years ago in a brickfield in the Kimmeridge Clay 

 at Swindon. It has been proved that some of the bones to which 

 the name Omosaurus^ has been applied really belonged to the 

 former genus. 



With such complete specimens now known by Professor 

 Marsh's descriptions, it will not be necessary to mention the 

 meagre remains discovered in this country, or the conclusions 

 arrived at by Owen and Seeley, interesting as they are. 



In the year 1877 Professor Marsh described, in the American 

 Journal of Science, a considerable portion of a skeleton of a 

 Stegosaur, remarking that this genus proved to be one of the 

 most remarkable animals yet discovered. It was found on the 

 eastern flank of the Rocky Mountains, in strata of Jurassic age; 

 they indicated an animal about twenty-five feet long, and for this 

 discovery Science is indebted to Professor A. Lakes and Engineer 

 H. C. Beckwith of the United States Navy, who found the remains 

 in Colorado, near the locality of the gigantic Atlantosaurus. The 

 solid limb-bones seem to point to an aquatic life, but there can 

 be little doubt that the monster did not pass all its time in the 

 water. (Fig. 25 shows the skeleton.) * 



In 1879 Professor Marsh announced the discovery of additional 



* The Introduction and Succession of Vertebrate Life in America. An 

 address delivered before the American Association for the Advancement of 

 Science, at Nashville, Tenn., August, 1S77. See Nature, vol. xvi. 



^ Greek — stegos, roof or covering ; sauros, lizard. 



* Greek — omos, humerus, and sauros, lizard. 



* The writer is informed that this skeleton is not yet mounted in the 

 Yale College Museum, but that it will be before long. Our artist has drawn 

 it as if set up, with a man standing by for comparison. 



