100 R. S. Lull — Cretaceous Armored Dinosaur, 



' ' Another new member of the Stegosauria, from a lower hori- 

 zon [than the Denver beds] in the Cretaceous, was discovered 

 several years since, in "Wyoming, and is now in the Yale 

 Museum. The skull is not knoT\Ti, but various portions of the 

 skeleton were secured. One characteristic feature in this genus 

 is the dermal armor, which appears to have been more complete 

 than in any of the American forms hitherto found. This armor 

 covered the sides closely, and was supported by the ribs, which 

 were especially strengthened to maintain it. In the present 

 specimen, portions of it were found in position. It was regailarly 

 arranged in a series of rounded knobs in rows, and these protu- 

 berances have suggested the generic name. 



''Near the head, the dermal ossifications were quite small, 

 and those preserved are quadrangular in form, and arranged 

 in rows. The external surface is peculiarly marked by a texture 

 that appears interwoven, like a coarse cloth. This has suggested 

 the specific name, and is well shown in the cut below [our Fig. 1]. 



"The fore limbs are especially massive and powerful, and are 

 much like those of the Jurassic Stegosaurus. There were five 

 well-developed digits in the manus [see below], and their 

 terminal phalanges are more narrow than usual in this group. 

 The ribs are T-shaped in transverse section, and thus especially 

 adapted to support the armor over them [see, however, below] . 

 The caudal vertebras are more elongate than those of Stegosaurus, 

 and the middle caudals have a median groove on the lower 

 surface of the centrum. 



"The animal when alive was about 30 feet in length. The 

 known remains are from the middle Cretaceous of Wyoming." 



This description was repeated almost verbatim in 

 Dinosaurs of North America, 1896, p. 225, pi. 75, fig. 5, 

 as Professor Alarsh did not extend Ms study of the form. 

 He prefixed the family designation Nodosauridae at 

 the beginning of this reprinted description, but without 

 definition. In 1895 (p. 497) , however, he thus defines it : 



"Family Nodosauridag. Heavy dermal armor. Bones solid. 

 Fore limbs large; feet ungulate. 



"Genus Nodosaurus. Cretaceous America." 



This is also repeated verbatim in Dinosaurs of North 

 America, p. 243. 



MORPHOLOGY. 



Endoskeleton. 



Presacral vertehrce and rihs. 



(PL I, figs. 1-3; text fig. 2.) 



One mass of matrix contains two nearly complete and 

 apparently ankylosed vertebrae, with the attached ribs 



