24.0 PERMIAN FOSSILS. 
PALHOSAURUS PLATYODON, Riley and Stutch. Owen, Eleventh Report Brit. Assoc., 
p. 154, 1842. 
ea = Mu; Morris, Catalogue, p. 209, 1843. 
us = ey De Verneuil, Bull. Soc. Géol. de France, 
2™* série, vol. i, p. 42, 1844. 
= = ne Geol. Russ., vol. 1, p. 226, 1845. 
— — fi Tennant, Strat. List, p. 89, 1847. 
“Tn the formation which contained the jaw and teeth of the Zhecodontosaurus, two 
other teeth were separately discovered, differing from the preceding and from each 
other; the crown of one of these teeth measuring nine lines in length and five lines 
in breadth. It is compressed, pomted, with opposite trenchant and serrated margins ; 
but its breadth, as compared with its length, is so much greater than in the Zheco- 
dontosaurus, that Dr. Riley and Mr. Stutchbury have founded upon it the genus 
Paleosaurus, and distinguished it by the specific name of platydon.” (Owen, Op. cit.) 
PALHOSAURUS CYLINDRODON, firley and Stutchbury. 
Saur1an, Williams. Proc. Geol. Soc., vol. 11, p. 112, 1834. 
PALHOSAURUS CYLINDRODON, Riley and Stutch. Proc. Geol. Soc., vol. 11, p. 398, 1836. 
— -— cs Sixth Report Brit. Assoc., Trans. Sec., 
p- 92, 1837. 
= He Trans. Geol. Soc., 2d series, vol. v, 
p. 352, pl. xxix, fig. 4, 1837. 
a Phillips, Lardner’s Cyc., Geology, vol. 1, 
p- 190, 1837. 
= == 5 Owen, Eleventh Report Brit. Assoc., 
p. 154, 1842. 
— as Morris, Catalogue, p. 209, 1843. 
— — a De Verneuil, Bull. Soc. Géol. de France, 
2™° série, vol. 1, p. 42, 1844. 
— — A Geol. Russ., vol. i, p. 228, i845. 
— = i Tennant, Strat. List, p. 89, 1847. 
The species has been founded on the second tooth noticed under Palgosaurus 
platyodon. 
“The portion of the tooth of the Palgosaurus cylindrodon which has been preserved, 
shows that the crown is sub-compressed and traversed by two opposite finely-serrated 
ridges, as in the Zhecodontosaurus and Rhopalodon; its length is five lines, its 
breadth at the base two lines.”’ (Owen.’) 
The Reptilian remains herein described ‘“‘ were found in quarrying the brecciated 
1 Eleventh Rep. Brit. Assoc., p. 154. 
