Photographie Atlas of Styracosaurus albertensis 



Ribs 



The ribs are, in general, well preserved, although some, particularly in the more delicate elements 

 toward the posterior end of the trunk, have sustained significant plastic deformation. 



We have numbered each rib according to its associated vertebra. For example, rib C 4 articulates 

 with the fourth cervical vertebra, rib T 2 with the second thoracic vertebra. The state of preservation 

 of the ribs is summarized below: 



C 2 (axial). Neither preserved 



C 3. Right only, capitulum restored 



C 4. Left only 



C 5. Right only 



C 6. Left only 



C 7. Both ribs preserved 



C 8. Left, distal tip restored; right except for part of capitulum 



C 9. Both ribs. 



T 1 . Both ribs, some sections of shafts filled with plaster on right 



T 2. Left complete; right, head and proximal one-third of shaft restored 



T 3. Left, head and proximal two-thirds of shaft restored; right, tuberculum restored 



T 4. Both ribs 



T 5. Both ribs, some plaster infill on capitulum of right 



T 6. Both ribs except for the distal 9 cm. of shaft of right 



T 7. Both ribs 



T 8. Both ribs, some plaster infill on left 



T 9. Both ribs, some plaster infill on left 



T 10. Both ribs 



Til. Both ribs, capitulum missing on both 



T 12. Right missing proximal half of capitulum; left has some infilling on shaft 



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