146 



Baron F. Nopcsa — British Dinosaurs — 



Though the humerus we are considering has heen somewhat 

 flattened by crushing, the inward bend of the radial crest does not 

 seem to have been as strong as in the humerus referred by Hulke to 

 HylcBOsaurus, with which it might otherwise be well compared. The 

 total length of the humerus is 50 cm. 



The ulna of 0. armatus is too much mutilated to be compared with 

 the same bone in St. prisms. If, however, we compare the ulna of 

 Stegosaurus, we find that it is less dilated at the proximal end and 

 that its shaft is much more slender (Fig. 5). The length of the ulna 

 from the humeral articular surface to the distal end is 40 cm. 



A large irregular flattened bone of somewhat parallelepiped shape, 

 the structure of which would indicate that it was almost completely 

 covered by a thin layer of cartilage, may be regarded as a proximal 

 carpal, though from lack of comparative material its position cannot 

 yet be determined with precision. 



Fig. 5. Ulna of St. priscus. 



According to Marsh separate carpals characterize the genus 

 Diracodon, and this would tend to indicate a close affinity between 

 our Stegosaurus and this genns, but I am quite open to the suggestion 

 that such a fusion of carpals in some Dinosaurs may be due only to 

 old age, and hence may not have either generic or even specific 

 value. 



The femur of the new Stegosaurus (Fig. 6c) is a long, straight, and 

 rather slender bone, somewhat compressed from back to front at each 



