EXPLANATION OF PLATES. 

 Plate 1. 



Upper figure quarry "No. 1," Garden Park, Fremont County, Colorado. 



From a photograph taken in 1901, showing the quarry as worked by the Carnegie Museum of 

 Pittsburgh, Pennsylvania. See p. 24. 



Lower figure quarry "No. 1," Garden Park, Fremont County, Colorado. 



From a photograph by I. C. Russell, taken at the time Felch was working here for Professor Marsh. 

 The man in the foreground is standing on the level from which the fossils have been removed. See p. 24. 



Plate 2. 



View of the upper or right side of the skeleton of Stegosaurus stenops Marsh. Type. Cat. No. 4934, 

 U.S.N.M. About Jj natural size. Shows the bones of the animal just as they were found and as now 

 exhibited (p. 106). 



The nonshaded portions represent restored parts. 



Plate 3. 



Outline of the skeleton of Stegosaurus steno]ys 

 ■^u natural size (p. 106). 



Ac, acetabulum. 



At, atlas. 



C4, fourth caudal. 



C17, seventeenth caudal. 



Ca, carpus. 



Cer 9, ninth cervical. 



Ch, chevron. 



Co, coracoid. 



DS, dorso-sacral (No. 27). 



F, femur. 



Fb, fibula. 



H, humerus. 



II, ilium. 



7s, ischium. 



Marsh. Designed as a key to plate 2. Scale about 



0, dermal ossicles. 



P3 to PIT, dermal plates, three to seventeen. 

 PS, presacrals (numbered from head toward 

 sacrum). 

 Pu, pubis. 

 R, radius. 

 S, dermal spine. 

 Sc, scapula. 

 T, tibia. 

 U, ulna. 



II, V, metacarpals two and five. 

 — », indicates direction of water current that washed 

 over the specimen. 



Plate 4. 



View of the lower or left side of the skeleton of Stegosaurus stenops Marsh. Type. Cat. No. 4934, 

 U.S.N.M. About -jV natural size. Shows the position of the dermal plates in relation to the other parts 

 of the skeleton. Since this drawing was made the contacts of many additional parts have been found, 

 which will account for various inconsistencies when compared with plates 2 and 3. 



C 2 , second caudal. P 13 to P l 



C17, seventeenth caudal. R, radius. 



Ca, carpus. R', ribs. 



Cer 6, sixth cervical. S, sacrum. 

 OS, caudo-sacral. 



Ch, chevron. 

 F, femur. 

 H, humerus. 

 Is, ischium. 

 II, ilium. 



0, dermal ossicles (improperly placed, 

 plate 3, for correct position). 



See 0, 



dermal plates, one to sixteen. 



S 3 , third sacral vertebra. 



Sc, scapula. 



Sc, ? (may represent fragment of the right scapula ) . 



T, tibia. 



U, ulna. 



II, V, metacarpals two and five. 



131 



