[Annals N. Y. Acad. Sci., Vol. XIX, No. 4, Part I, pp. 99-119. 31 July, 1909.] 
THE FOSSIL VERTEBRATES OF BELGIUM. 1 
By Louis Dollo. 
Professor in the University of Brussels; Curator of the Department of 
Living and Fossil Vertebrates of the Royal Belgian Museum of Natural 
History. Corresponding Member New York Academy of Sciences. 
Part I. Mesozoic. 
A. The most ancient Vertebrates of Belgium. 
In the present state of our knowledge (1908) we think that 
1. Fishes first appear in the Gedinnien (lower Devonian) of Ardennes 
(at Glaireuse in the commune of Villance, near Saint-Hubert, province of 
Luxembourg) in the form of an Ostracoderm, Pteraspis dunensis Roemer, 
1854. (L. Dollo, Comptes rend. Acad. Sci., Paris, 1903, cxxxvi, 699.) 
2. Amphibia appear in the Wealden (lower Cretaceous) of Hainault 
(at Bernissart a village situated between Mons and Tournai, on the frontier 
of France) in the form of a Urodele, Hylceobatrachus croyi Dollo, 1884. 
(Bull. Mus. roy. Hist. nat. Belg., 1884-5, iii, 91.) 
3. Reptiles appear in the lower Lias (lower Jurassic) of Luxembourg 
(in the suburbs of Arlon, capital of that province) in the form of an Ichthyo- 
saurian, Ichthyosaurus communis Conybeare, 1822. (Unpublished.) 
4. Birds appear in the lower Landenien (lower Eocene) of Hainault 
(at Mesvin near Mons) in the form of a gigantic wingless relative of the goose, 
Gastornis edwardsi Lemoine, 1878. (L. Dollo, Bull. Mus. roy. Hist. nat. 
Belg. 1883.) 
B. Strata in which Belgian fossil Vertebrata are found. 
1. Fishes. Fossil fishes are found at 26 different geological levels, well 
correlated stratigraphically. Their description is intrusted to Dr. 
R. H. Traquair, Honorary Curator of the Edinburgh Museum (pa- 
1 Translated by W. D. Matthew, Secretary, Section of Vertebrate Palteontology, Inter¬ 
national Correlation Committee, National Academy of Sciences. 
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