372 JL S. Lull — Stegosaiti'itK uugulatiis Mars/i. 



and the other witliin the sacrum. In the former, for a space 

 of about four vertebriv, tlie neural canal, after an avera,i>-e width 

 of ()-25''"', increases to (1-38™' and to a i)rop()rtionate liei<j;ht in 

 the Xltii vertehriim. 



The neural canal in the sacrum is of startling dimensions, 

 havino- a maximum enlargement of I'li"" and a irreatest width 

 of O-Oo*^'", and displaces nearlj^ 1200°'' of water, tlius giving it a 

 mass more than twenty times that of the brain. 



The brachial enlargement was the seat of the innervation of 

 tlie powerful fore limbs, while that of the sacrum was mainly 



Fig. 9. 



Fig. 9. Cast.s of cranial and sacral cavities, showing proportions of brain 

 to sacral enlargement of the spinal cord. 1/3 natural size. 



the reflex and coordinating center for the control of the 

 mighty nmscles of the hind limbs but more especially of the 

 powerful, active and aggressive tail Avhich constituted the 

 principal means of defense. 



V. Reiftoratlon in the Flesh. 



Under the direction of Mr. F. A. Lucas, Curator-in-Chief of 

 the Museum of the Brooklyn Academy of Arts and Sciences 

 and formerly of the U. S. J^Jational Museum, two restorations 

 were made by the artist, Charles R. Knight. Of these, the 

 first was a drawing published by Lucas in 1901 in his book, 



