60 



UNITED STATES NATIONAL MUSEUM. 



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

 The zygapophyses continue to wdthin three or four of 

 b 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 ofStegosaurus. 



Fig. 28.— Median caudal vertebra 



POSTERIOR TO THE 2GTH OF STEGO- 

 SAtTRUS UNGDLATUS MAESH. J 



NAT. SIZE, a, Side view, b, Front 

 VIEW. After Harsh. 



No. 

 ot 

 ver- 

 te- 

 brae 

 in se- 

 ries. 



Greatest length of centra. 



Greatest transverse diameter 

 posterior end of centra. 



Greatest height of vertebrae, 

 over all. 



No. 

 4288. 



mm. 



No. 

 4714. 



mm. 



No. 

 4934. 



No. No. 

 )099. 6135. 



1 



No. 

 6531. 



mm. 



No. 

 6629. 



No. 

 4288. 



mm,. 



No. 

 4714. 



No. 

 4934. 



mm. 



No. 

 6099. 



mm. 



No. 

 6135. 



mm. 



No. 

 6531. 



mm. 



No. 

 6629. 



mm. 



No. 

 4288. 



mm. 



No. 

 4714. 



No. 

 4934. 



No. 

 6099. 



mm. 



No. 

 6136. 



mm. 



No. 

 6531. 



mm. 



No. 

 6629. 



mm. 





mm. 



mm. 



2 













































■■ 





46 

 57 

 65 

 58 

 58 

 59 

 60 

 61 

 66 

 64 

 63 

 66 

 67 

 65 

 71 

 61 

 65 

 66 

 64 

 61 

 62 

 62 

 61 

 61 

 66 

 64 

 49 



77 

 66 

 62 

 65 

 68 

 72 

 70 

 66 

 66 

 65 

 66 

 63 

 64 

 63 

 68 

 71 

 65 

 60(?) 

 60C?) 

 70(?) 













137 









































































52 

 49 

 52 

 55 

 55 

 56 

 54 

 54 

 56 

 66 

 55 

 53 

 32 

 54 

 54 

 64 

 66 

 55 

 53 

 53 

 51 

 51 

 50 

 49 

 49 







92 

 98 

 92 



























" 



















98 

 88 

 90 

 91 



88 

 85 

 76 

 76 

 72 

 68 

 70 

 66 

 64 







320 

 306 

 300 

 285 

 255 

 245 

 233 

 224 













7 

































"■ 





























265 





"■ 













86 



78 



















10. 



u. 



12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27 

 28 

 29 



62 

 48 

 48 

 46 

 45 



























262 

































































































68 

 67 

 65 



















210 

 180 























210 

 203 



































70 

 68 

 65 

 64 

 64 

 63 

 61 

 69 



eo 



61 



67 

 57 

 56 











58 

 58 

 58 

 65 

 65 

 54 

 59 

 57 

 56 

 65 













178 

 160 

 160 









57 

 65 

 62 











194 

 175 

 175 

 163 



























52 































146 

 136 

 126 

 125 

 124 



150 



45 

 44 

 46 

 46 

 46 

 45 

 44 

 43 









66 

 64 

 56 

 56 

 65 

 61 

 50 

 52 



58 













52 

 55 

 43 

 48 

 46 

 48 

 48 















160 











66 





143 

 135 

 120 

 115 

 109 









67 

 61 

 60 

 60 

 55 

















47 

 45 

 47 

 45 



























60 



53 

















116 





88 

















