42G ME. ST. GEOEGE MIVAET OX THE 



The defect of ossification in the neural arch is very small and behind the diapophjsis 

 (fig. 61, 9). 



The diapophysis (figs. 59 & 61, d^) is much larger, more expanded dorso-ventrally, and 

 is connected with the root of the spinous process by a ridge ; it projects outwards and 

 dorsad and very slightly postaxiad. 



The neural lamina is scarcely notched behind for the spinal nerves ; and the post- 

 A'ertebral interspace is less than in the two preceding vertebi-£e. 



The capitulum is again united by suture, but is supported more by the preaxial 

 parapophysial surface of its own centrum than by the postaxial central projection of the 

 thirty-sixth vertebia (fig. 60). The capitulum, though it arises from a similarly expanded 

 base, does not contract so much as in the preceding vertebra; it extends and expands 

 to join its serial predecessor and successor ; but it projects slightly preaxially instead of 

 projecting postaxially as does that of the thirty-sixth vertebra. 



The Thirty-eighth Vertebra. 



This vertebra (figs. 59, 60, & 61, lo) has its centrum a little more antero-posteriorly 

 extended (fig. 60, lo) and considerably more convex transversely than the centrum of 

 the preceding vertebra. 



Its neural spine is quite free, less high, and more slender. 



Its dicqjopki/sis (figs. 59 & 61, fZ'") closely resembles that of the thirty-seventh vertebra ; 

 but its capitulum is anchylosed (fig. 60, p^°) at a time when the two preceding capitula 

 are still united by suture to the centra. It is almost entirely supported by its own 

 centrum, is still less contracted above its origin, and, projecting decidedly preaxiad as 

 well as dorsad, comes into contact with its own diapophysis, as well as anchyloses with 

 the two capitula preceding. 



There is no lateral defect of ossification in the neural arch ; but it is slightly exca- 

 vated in the middle line postaxially to the neural spine. 



There is no postvertebral interspace or perforation, except what is quite minute. 



THE SACRO-CAUDAL VERTEBRAE. 



The Thirty-ninth Vertebra. 



This vertebra (figs. 59, 60, & 61, ii) is slightly more antero-posteriorly extended 

 than is the preceding vertebra ; its neural spine is lower and more slender ; and its 

 neural arch is medianly notched at its postaxial border, very decidedly (fig. 61, u) and 

 slightly so at the middle of its opposite margin. 



Diapophysis, parapophysis, and capituhan all combine in one anchylosed transverse 

 process, which projects much, as does the diapophysis of the thirty-eighth vertebra, but 

 is never dorso-ventrally extended. Its most ventral point of origin does not extend so 

 far ventrad as does that of the capitulum of the preceding vertebra. 



