8 Prof. 0. C. Marsh — European Dinosaurs. 



of the well-known Belgian specimens, the originals of which I have 

 studied with considerable care during several visits to Brussels. The 

 descriptions and figures of Dollo ' have been used in the preparation 

 of this restoration. A few changes only have been introduced in 

 the accompanying Plate, based mainly upon a study of the original 

 specimens. 



Besides the four genera here represented, no other European 

 Dinosaurs at present known are sufficiently well preserved to admit 

 of accurate restorations of the skeleton. This is true, moreover, of 

 the Dinosaurian remains from other parts of the world outside of 

 North America. 



To present a comprehensive view of the Dinosaurs, so far as now 

 known, I have prepared a plate, here shown, which gives restora- 

 tions of the twelve best-known tj'pes, as I have thus far been 

 able to reconstruct them. Of these twelve forms, eight are from 

 America : Ancliisaurus, a small carnivorous type from the Trias ; 

 Bronlosaurus, Camptosaurus, Laoscmrus, and Stcgosaurus, all herbi- 

 vorous, and the carnivorous Ceratosaurus, from the Jurassic; with 

 Claosaurus and Triceratops, herbivores from the Cretaceous. These 

 American forms, with the four from Europe alread}' noticed, complete 

 the series represented on this chart. 2 They form an instructive group 

 of the remarkable reptiles known as Dinosauria. 



The geological positions of Compsognathus and of Scelidosaurus 

 are fully determined, but that of Hypsilopliodon and Iguanodon is not 

 so clear. The latter are found in the so-called Wealden, but just 

 what the Wealden is I have not been able to determine from the 

 authorities I have consulted. The Cretaceous age of these deposits 

 appears to be taken for granted here, but the evidence as it now 

 stands seems to me to point rather to the Upper Jurassic as their 

 true position. If I should find the vertebrate fossils now known 

 from your Wealden in the Rocky Mountains, where I have collected 

 many corresponding forms, I should certainly call them Jurassic, 

 and have good reason for so doing. Moreover, after visiting typical 

 Wealden localities here and on the Continent, I can still see no 

 reason for doing otherwise so far as the vertebrate fossils are 

 concerned, and in such fresh-water deposits their evidence should 

 be conclusive. I have already called attention to this question of 

 the age of the Wealden, and do so again, as I believe it worthy of 

 a careful reconsideration by English geologists. 



EXPLANATION OF PLATES I-IV. 

 Plate I. — Outline restoration of the skeleton of Compsognathus hngipes, Wagner. 



One-fourth natural size. Jurassic, Bavaria. 

 Plate II. — Outline restoration of the skeleton of Sce/idosaim<s Karrisonii, Owen. 



One -eighteenth natural size. Jurassic, England. 

 Plate III. — Outline restoration of the skeleton of Sypsilophodon Fo.rii, Huxley. 



One-eighth natural size. AVealden, England. 

 Plate IV. — Outline restoration of the skeleton of Iguanodon Bernissartensis, 



Boulenger. One-fortieth natural size. "Wealden, Belgium. 



1 Bulletin Royal Museum of Belgium. 1882-1888. 



2 A copy of this Chart will appear in the next Number of this Magazine. — Edit. 

 Geol. Mag. 



