ANIMALS. 239 



An Additional Species, Riley and Stutchbury . SLxth Report of the British Association, 



Trans. Sect., pp. 90-93, 1837. 



Thecodontosaurus „ Trans. Geol. Soc, 2d series, vol. v, 



p. 350, pi. xxix, figs. 1, 2, 3, 1837. 



— „ Pbiiiips, Lardner's Cyclop., Geology, 



vol. i, p. 190, 1837. 



— ANTiauus. Owen, Eleventh Report Brit. Assoc, p. 190, 1842. 



— — „ Morris, Catalogue, p. 211, 1843. 



— •-- „ De Verneuil, Bull. Soc. Geol. de France, 2"° serie, 



vol. i, p. 42, 1844. 



— — „ Geol. Russ., vol. i, p. 228, 1845. 

 — „ Tennant, Strat. List, p. 88, 1847. 



The Rev. David Williams, Dr. Riley, and Mr. Stutchbury have described some 

 jaws and teeth of this species. One of these remains, which is in the " Museum of the 

 British Institution, is the right ramus of a lower jaw, three and a quarter inches long, and 

 one and a half in the greatest depth, from the summits of the teeth to the under rise, 

 consisting of the dental bone, containing twenty-one teeth, with portions of the sub- 

 angular and complementary bones, and perhaps traces of the opercula. The alveolar 

 groove for the reception of the teeth is formed by two ridges of nearly equal height, 

 the teeth being deposited in it, in distinct alveoli, to nearly half their length. The 

 teeth somewhat resemble a surgeon's abscess-lancet, being acutely pointed, and 

 flattened ; while the anterior edge is also curved, but concave and strongly serrated, 

 the serrature being directed towards the apex of the tooth. The middle teeth are the 

 largest, rising not less than a quarter of an inch above the socket."^ 



Thecodontosaurus antiquus was discovered in conglomerate resting on the edge of 

 inclined strata of mountain limestone at Redland near Bristol. 



Genus Palaosatirus, Riley and Stutchbury. 

 " The characters of this group are derived from certain teeth, which are described 

 as being carinated laterally, and finely serrated at righf angles to the axis."" 



PALiEOSAURUS.PLATYODON, BUei/ and Stutcltbury. 



Saurian, Williams. Proc. Geol. Soc, vol. ii, p. 112, 1834". 



P.VL^osAUEUS PLATYODON, UHey and Stutch. Proc. Geol. Soc, vol. ii, p. 398, 1836. 



— — „ Sixth Report Brit. Assoc, Trans. Sec, 



p. 91, 1837. 



— — „ Trans. Geol. Soc, 2d series, vol. v, p. 352, 



pi. xxix, fig. 5, 1837. 



1 Riley and Stutchbury, Proceedings of the Geol. Soc, vol. ii, p. 398. 



2 Ibid. 



