246 



SUPPLEMENT. 



Fig. 55. 



Left lateral (A), anterior (B), and hgemal (C) aspects of the axis vertebra of a 

 Dinosaur ; from the Wealden of the Isle of Wight. \. a, upper (dia- 

 pophysis) costal articulation; b, lower do. (parapophysis) ; c, axial 

 intercentrum (hypapophysis) ; d, articulation for centrum of atlas 

 (odontoid process) ; e, articulation for inferior ring of atlas. (From 

 the ' Quart. Journ. Geol. Soc.'). 



by the writer in the ' Quart. Journ. Geol. Soc.' vol. xlv. 

 p. 44, fig. 2 ; the figure being reproduced in the ac- 

 companying woodcut. Fox Collection. Purchased, 1882. 



Family ANCHISAURID^E {suprh, i. p. 174). 



In addition to their more or less oblique and continuous serration 

 the teeth are characterized by their short and somewhat thickened 

 crowns, of which the posterior border is either slightly convex or 

 nearly straight. 



In the Meg alosaur idee the crowns are more compressed and taller, 

 with a distinctly concave posterior border ; Epicampodon {supra, i. 

 p. 174, fig. 29) approximating to this type. 



Genus THECODONTOSAURUS {supra, i. p. 174). 



The teeth with the posterior border distinctly convex. 



It is possible that Anchisaurus may prove to be inseparable from 

 this genus, and in that, if not in any, case the family name Theco- 

 dontosauridce should be adopted. 



Thecodontosaurus platyodon (Riley and Stutchbury 1 ). 

 Syn. Palceosaurus platyodon, Riley and Stutchbury 2 . 



1 Proc. Geol. Soc. vol. ii. p. 398 (1836, vol. dated 1838).— Palceosaurus. 

 3 Loc. cit. 



