210 Kansas Academy of Science. 



a still better specimen of the same species — complete, in fact, 

 which was sent to the British Museum. With it were the 

 front and hind limbs sufficiently complete to enable Dr. A. 

 Smith Woodward to g-et the correct proportions — a vital thing 

 in connection with the skull, for the identification of scattered 

 material. 



The specimen most unique and desired is a complete skeleton 

 of the great plated dinosaur Stegosauria, with its wonderful 

 arrangement of bony plates in place. George discovered a 

 nearly complete skeleton with the skull, which Lambe calls 

 Stereocephalus tutus. In this species there is a clublike pro- 

 tuberance at the end of the tail. I secured one with a few feet 

 of the end of the tail. There are three great bony sections, 

 spherical in form, flattened above and below, seventeen inches 

 long, thirteen inches wide, and ten inches high. The distal 

 caudal vertebrae are welded to gether by the ossification of the 

 tendons, which lie along the spines and chevrons, into a round 

 solid handle, as it were, which is inserted into the center of the 

 dermal plates and united to them. What a powerful weapon 

 with which to break the ribs of a carnivore if he got near 

 enough, though he really needed no defense, as he could safely 

 trust his armor, which evidently covered the entire body and 

 is anchylosed to the top of the head. Its arrangement, to my 

 knowledge, is not yet well known. Brown, in his restored 

 Ankylosaurus, once attempted to arrange the dermal plates, 

 but unsuccessfully, as must always be the case unless it is first 

 seen in the specimen itself. 



A wonderful discovery of Brown's is that the great plates of 

 bones which cover the entire body have small nodules of bone 

 arranged beneath the body, like the chain armor of the old Ro- 

 man soldiers, allowing motion of the skin in any direction. This 

 is verv diff'erent from the turtle and the Glyptodon, which are 

 encased in an immovable armor for life. Mr. Lambe's studies 

 have shown that these animals wear around the neck, next to 

 the skull, a necklace of bony plates with keeled centers. I was 

 so fortunate two seasons ago as to find a number of the plates 

 in position over the dorsal spines. We found pelvic arches 

 six feet in width and ribs five feet long, showing the enormous 

 proportions of this form. I know Mr. Brown has a large 

 amount of stegosaurian material, and I hope soon to see it 

 published. The skull, as is common in the family, is quite 



