ANIMALS. 239 
An Appitr0na Spxctes, Riley and Stutchbury. Sixth Report of the British Association, 
Trans. Sect., pp. 90-93, 1837. 
THECODONTOSAURUS Ms Trans. Geol. Soc., 2d series, vol. v, 
p. 390, pl. xxix, figs. 1, 2, 3, 1837. 
ee i Phillips, Lardner’s Cyclop., Geology, 
vol. i, p. 190, 1837. 
a ANTIQUUS. Owen, Eleventh Report Brit. Assoc., p. 190, 1842. 
pos = » Morris, Catalogue, p. 211, 1843. 
= » De Verneuil, Bull. Soc. Géol. de France, 2™* série, 
vol. 1, p. 42, 1844. , 
te ass » ~ Geol. Russ., vol. i, p. 228, 1845. 
_— » Tennant, Strat. List, p. 88, 1847. 
The Rev. David Willams, 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 Palgosaurus, Riley and Stutchbury. 
“The characters of this group are derived from certain teeth, which are described 
as being carinated laterally, and finely serrated at right angles to the axis.’” 
PALHOSAURUS PLATYODON, Sivley and Stutchbury. 
Saurian, Williams. Proc. Geol. Soc., vol. ii, p. 112, 1834. 
PALHOSAURUS PLATYODON, Riley and Stutch. Proc. Geol. Soc., vol. ii, p. 398, 1836. 
— — i Sixth Report Brit. Assoc., Trans. Sec., 
p- 91, 1837. 
— — a Trans. Geol. Soc., 2d series, vol. v, p. 352, 
pl. xxix, fig. 5, 1837. 
1 Riley and Stutchbury, Proceedings of the Geol. Soc., vol. ii, p. 398. 
2 Thid. 
