60 



BULLETIN 89, UNITED STATES NATIONAL MUSEUM. 



a 



the posterior zygapophyses being well within the posterior boundary of the centra. 



The zygapophyses continue to within three or four of 

 the tip, as shown in plate 16. 



In placing the first chevron on the third caudal, 

 Marsh is probably correct, although I have no positive 

 evidence on this point. The most anterior caudals 

 are without distinct chevron facets. In both No. 4714 

 and No. 6531 the sixth caudal is the first to show well- 

 defined facets for chevron bones, although they were 

 found articulated in advance of this point. 



In the median caudals the facets are placed on prom- 

 inent tubercles developed on the postero-inferior surface 

 (fig. 28), and although gradually diminishing in size, 

 are present on all except the last few at the tip. In 

 specimen No. 4714 the third caudal from the distal end has a chevron still articu- 

 lated, as shown in plate 16. 



Measurements of caudal vertebrae of Stegosaurus. 



Fig. 2S. — Median caudal veetebba 

 posterior to the 20th of stego- 

 saurus ungulatus marsh, j 

 nat. see. 0, sdje view, b, front 

 view. After Marsh. 



No. 

 of 

 ver- 

 te- 

 brae 

 in se- 

 ries. 



Greatest length of centra. 



Greatest transverse diameter 

 posterior end of centra. 



Greatest height of vertebrae, 

 over all. 



No. 



1288. 



No. 



4714. 



No. 



4934. 



No. 



6099. 



No. 



6135. 



No. 



6531. 



No. 

 6629. 



No. 

 4288. 



No. 



4714. 



No. 



4934. 



No. 



6099. 



No. 



6135. 



No. 

 6531. 



No. 

 6629. 



No. 



4288. 



No. 



4714. 



No. 

 4934. 



No. 

 6099. 



No. 

 6135. 



No 

 6531. 



No. 

 6629. 



1.. 



mm. 



mm. 



772771. 



mm. 



mm. 



mm. 



mm. 



mm. 



mm. 



mm. 



mm. 



777777. 



777777. 



777777. 



777777. 



777777. 



777777. 



777777. 



mm. 



mm. 



777777. 



2— 













































3.. 





46 

 57 

 55 

 58 

 58 

 59 

 60 

 61 

 66 

 64 

 63 

 66 

 67 

 65 

 71 

 61 

 65 

 66 

 64 

 61 

 62 

 62 

 61 

 61 

 56 

 54 

 49 



77 

 66 

 62 

 65 

 68 

 72 

 70 

 66 

 66 

 65 

 66 

 63 

 64 

 63 

 68 

 71 

 65 

 60(?) 

 60(?) 

 70(?) 













137 



























4.. 















































52 

 49 

 52 

 55 

 55 

 56 

 54 

 54 

 55 

 56 

 55 

 53 

 52 

 54 

 54 

 54 

 56 

 55 

 53 

 53 

 51 

 51 

 50 

 49 

 49 







92 

 98 

 92 



























6.. 



















98 

 88 



90 

 91 

 88 

 85 

 76 

 76 

 72 

 68 

 70 

 66 

 64 







320 

 305 

 300 

 285 

 255 

 245 

 233 

 224 













































8-. 





























265 





9.. 













86 

 78 



















10. 

 11. 

 12. 

 13. 





























262 

























































































14. 

 15. 













68 

 67 

 65 



















210 

 180 























210 

 203 









16. 



17. 































70 

 68 

 65 

 64 

 64 

 63 

 61 

 59 



eo 



61 

 57 

 57 

 56 











58 



58 

 58 

 55 

 55 



54 

 59 

 57 

 55 

 55 













178 

 160 

 160 





18. 



















194 

 175 

 175 

 163 









19. 

 20. 

 21. 

 22. 









57 

 55 

 52 

























52 































146 



136 

 126 

 125 



124 



150 



45 

 44 

 46 

 46 

 46 

 45 

 44 

 43 









56 

 54 

 58 

 56 

 55 

 51 

 50 

 52 



58 











23. 







52 

 55 



45 

 48 

 46 

 48 

 48 















160 



24. 

 25. 

 26. 

 27. 

 28. 

 29. 



52 

 4S 

 48 

 46 

 45 











56 





143 

 135 

 120 

 115 

 109 









67 

 61 

 60 

 60 

 55 

















47 



45 



47 



'45 



























60 



53 

















116 





88 















