EXPLANATION OF PLATE IV. 



Agathaumas si/lvestre, one-sixth natural size, except 19-20, which are one-fourth the same. 



Figs. 1-16. A continuous series of dorsal, lumbar, and sacral vertebra?, viewed from the right side; one 



only of the neural arches found iu place. 

 Fig. 2. Second vertebra of the series : a, viewed from behind. 



Fig. 7. Antepenultimate lumbar vertebra: c, viewed from before; d, viewed from behind. 

 Figs. 10-16, a. The sacral series viewed from above. 



10-16, b. The same viewed from below. 

 Fig. 10, c. Proximal end of sacrum. 



14, c. Dis al end of tho fifth vertebra of the same. 



16. Seventh sacral vertebra: c, anterior view; (7, posterior view, both exhibiting the inferior posi- 



tion of the articular surface for the diapophysis. 



17. A more distal sacral vertebra: b, from below. 



18. The neural arches of two consecutive ? sacral vertebra?, eoosified, and with diapophyses free 



from the ceutrum: a, from above. 

 Figs. 19-20. Undetermined bones. 

 Fig. 21. Lateral view of the acetabular portion of tho ilium, with tho base of the ischium continuous 



with it ; a, tho same, viewed from below. 



