NO. 1666. OSTEOLOGY OF CAMFTOSAURUH—GILMORE. £33 



dorsal region have rounded ventral surfaces. Posteriorly the centra 

 gradually increase in bulk. 



The elevated neural processes of the anterior dorsal region become 

 lower posteriorly, while the low, thin, plate-like neural spines gradu- 

 ally increase in height, with thickened terminal extremities that 

 reach their maximum development in the sacral region. 



The transverse processes, stout and relatively long in the anterior 

 dorsal region, have a capitular facet on the fourth dorsal, well up 

 under their front edges, where they spring from the neural arch, and 

 tubercular facets on their outward extremities (see d and p, fig. 15). 

 The capitular facet Avithdrawn from the centrum on the first dorsal 

 reaches the anterior border of the diapophysis in the fourth. Pos- 

 teriorly the capitular facet gradually moves outward on the anterior 



KiG. 10. (1) TlIIKTEENTII DORSAL VERTEBRA OF C.V.MPTOSAURUS BROWNI. HOLOTYPE. CaT. 



No. 4282, T'.S.N.M. ; J x.\t. size, side view; (2) anterior view of same; «. si/g. 



PEEZYGAPOPHVSES ; d, DIAPOPHYSIS ; p, PARAPOPHYSI.S ; p. ~y<l, POSTZYGAPOPHY.SIS ; H. 

 NE0RAL SPINE. FROM .V PHOTOGRAPH. 



face of the transverse. Judging from the size of the capitular facet 

 and the capitulum of the rib pre.'^erved in place, the seventh dorsal 

 supports the heaviest rib of the series in No. 4282. The transverse 

 processes are directed backward and somewhat upward from the 

 horizontal as they leave the neural arches, and from the mid-dorsal 

 region posteriorly thej^ become more slender and somewhat shorter, 

 with a decrease in size of the tubercular and capitular facets (see fig. 

 IG, d and p). The diapophj^ses of the dorsals are supported by 

 heavy buttresses or lamina Avhich rise obliquely forward to their un- 

 der surfaces from the lower and back part of the neurapophyses. 

 They form the outer boundary of deep, three-sided hollows, as shown 

 in fig. 15. These cavities gradually grow shallower from front to 

 back. The posterior zygapophyses overhang the end of the centrum. 



