206 



THE BATH OOLITE PERIOD. 



CHAP. 



The transverse processes of the two anterior vertebrae are broken,, 

 and shew cavities in the interior about three-fourths of an inch 

 across; probably the others are similarly constructed. Narrow 

 ridges connect these processes with the cornice on the level of the 

 zygapophyses, having deep hollows on each side. It appears that 

 each of these processes was in contact with the broad ilium which 

 must have sloped away from the sacrum on each side, like a pent- 

 house, as it does in the ostrich (see Diagram No. LXI. fig. 2). The 

 narrowness of the whole pelvic fabric considered in relation to 

 length, height, and tripartite crest of bone, gives a very ornithic 

 aspect to this part of the skeleton. There is no cavity in the body 

 of the vertebrae. 



Diagram LXI. Megalosaurus and Teleosaurus. One-tenth of natural size. 



Cross sections of the sacral vertebrae. 



i. Cross section of sacral vertebra of teleosaurus. 2. Cross section of sacral mass 

 through the fourth (most prominent) transverse process of megalosaurus. 3. Cross 

 section through the middle of a vertebra of megalosaurus, shewing at r the passage of 

 a nerve channel, and at c inclosed air cavities which lighten the bony mass. They 

 are seen in the first vertebra, and probably exist in the others, i. Marks of attach- 

 ment of the ilium. The dotted lines by fig. 2 indicate the probable outward slopes of 

 the ilia. 



The sacral vertebra? have the following lengths, measured 

 below : 



inches. 



First 4-45 



Second 4-25 



Third 3-90 



Fourth 4-25 



Fifth 4-45 



The height of the anterior face is 4-00 inches, the breadth 3*80. 

 It is distinctly pitted in the middle, and revolute toward the lower 

 margin. 



