250 PERMIAN FOSSILS. 
1818.—VoreT. Practische gebirgskunde. 
1819.—D’AvusBuisson DE Voisons. Traité de Géognosie, &c. 
1820.—StTERNBERG. Versuch einer geognostisch-botanischen Darstellung der Flora der Vorwelt; and 
Exposé Géognostico Botanique de la Flore du Monde Primitif. 
1820.—ScuiLotHrmm. Die Petrefactenkunde, &c. 
1821.—WeaAvER. ‘On Floetz Formations ;’ in the Annals of Philosophy, N.S., vol. ii. 
1821.—Mituer. Natural History of the Crinoidea, 4to. (Cyathocrinus ramosus.—C. planus.) 
1821.—J. Sowrrsy. Mineral Conchology of Great Britain. (Schizodus obscurus.) 
1822-1823.—ScutotHEem. Nachtrage zur Petrefactenkunde. (Janassa bituminosa.) 
1822.—ConnyBEARE and Puriurps. Outlines of the Geology of England and Wales, vol. i. 
1823-1825.—J. Sowrrsy. Mineral Conchology of Great Britain, vol. iv. (Productus horridus, and 
Byssoarca tumida.) 
1825.—Dr. Bout. ‘Geological Distribution of the Fossil Organic Remains, enumerated by Baron von 
Schlotheim ;’ in Edinburgh Philosophical Journal, vol. xii. 
1825.—Ka@nic. Icones Fossilium Sectiles. (Productus horridus.—P. Hoppi.) 
1825.—KruceEr. Urweltliche Naturgeschichte der organischen Reiche, (Productus horridus, &c.) 
1826.—De France. Dictionnaire des Sciences Naturelles, vol. xliii. (Productus horridus.) 
1826.—Sepewick. On some Beds associated with the Magnesian Limestone, and on some Fossil Fish 
found in them. Proceedings of the London Geol. Soc., vol. i. 
1826-1828.—GoLpruss. Petrefacta Germaniz. (Corals.) 
—Srpewrck. ‘On the Geological Relations and Internal Structure of the Magnesian Limestone, and 
1826. the lower portions of the New Ked Sandstone Series, in their range through Nottinghamshire, 
1829. Derbyshire, Yorkshire, and Durham, to the southern extremity of Northumberland.’ Transactions 
of the Geological Society of London, 2d series, vol. iii. 
1827.—Bronn. Zeitschrift fiir Mineralogie, vol. 2. (Productus horridus.) . 
1827.—Ho«e. Natural History of the Vicinity of Stockton-on-Tees. (? Fenestella retiformis.) 
1827.—J. Sowmrsy. Mineral Conchology of Great Britain, vol. vi. (Trigonotreta undulata, &c.) 
1827.—G. B. Sownrsy. Genera of Recent and Fossil Shells. (Trigonotreta undulata, &e.) 
1828.—SprenceLt. Commentatio de Psarolithes, ligni fossils genere. Hale. 
1828.—Puruties. Geological Observations made in the Neighbourhood of Ferrybridge in the year 1826. 
Philosophical Magazine, N.S., vol. iv. 
1828.—Bronn. Leonhard’s Min. Taschenbuch. (Cupressites Ulmanni.) 
1828.—Firmine. History of British Animals, &c. 
1828.—Ap. Broneniart. Prodrome d’une Histoire Naturelle des Végetaux Fossiles; and Histoire des 
Végétaux Fossiles. (Alge.) 
1829.—Atnx. Bronenrarr. ‘Tableau des Terrains qui composent lecorce du Globe. 
1829—Haninauaus. Verzeichniss der Von F. W. Heeninghaus in Crefeld dem Museum der Universitat 
Bonn (zur Beforderung grossern Nutzens in dem Naturwissenschaften) tiberlassenen Petrefacten 
Sammlung, p. 18. 
829.—Ure. New System of Geology. (Protorosawrus Speneri.) 
929.—MutnstEr. Petrefacta Germaniz. (Bwalves.) 
1037-1833.—De5 ta Becue. Geological Manual. 
1834.—Sepewick. ‘On the Deposits overlying the Carboniferous Series in the Valley of the Eden, and 
on the North-western Coasts of Cumberland and Lancashire,’ published in vol. 1. of the 
Proceedings, and vol. iv of the Transactions of the Geological Society of London. (Calamites.) 
1832.—Corra. Die Dendrolithen in Beziehung auf ihren Bau. Dresden. 
1832.—Von Meyer. Paleologica. (Protorosaurus Spenert.) 
1832.—Von Decuren. De la Beche, Handbuch der Geognosie. 
