ON A 
FOSSIL SAURIAN 
OF THE 
NEW RED SANDSTONE FORMATION 
OF PENNSYLVANIA, 
WITH SOME 
ACCOUNT OF THAT FORMATION. 
ALSO ; ON SOME 
NEW FOSSIL MOLLUSCS, 
IN THE 
CARBONIFEROUS SLATES 
OF THE 
ANTHRACITE SEAMS OF THE WILKESBARRE COAL FORMATION, 
BY 
ISAAC LEA, 
Member of the Am. Phil. Soc.; of the Acad, of Nat. Sciences of Philadelphia; of the Zool. Soc. of 
London ; of the Imperial Soc. of Moscow, &c. &c. 
PHILADELPHIA: 
Merrihew & Thompson, Printers, No. 7 Carter’s Alley. 
1 8 5 2. 
