EXPLANA.TION OF PLATE IV. 



Agathaumas sylvestre, one-sixth natural size, except 19-20, which are ouc-foiirth the same. 



Figs. I-IO. A coutinuons series of dorsal, lumbar, ami sacral vertebrae, viewed from the right side; one 



only of the neural arches found in place. 

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



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

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



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

 Fig. 10, c. Proximal end of sacrum. 



14, 0. Dis'al end of the fifth vertebra of tlie same. 



16. Seventh sacral vertebra: c, anterior view; d, 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 ? sf.cral vertebra;, coosified, and with diapophyses free 



from the centrum: a, from above. 

 Figs. 19-20. Undetermined bones. 

 Fig. 21. L.ater,al view of the acetabular portion of the ilium, with the base of the ischium continuous 



with it ; o, the same, viewed from below. 



