412 Marsh—festoration of European Dinosaurs. 
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 the plate here shown, which 
gives restorations of the twelve best-known types, as I have thus. 
far been able to reconstruct them.* Of these twelve forms, 
eight are from America: Anchisaurus, a small carnivorous 
type from the Trias; Brontosawrus, Camptosaurus, Laosaurus, 
and Stegosaurus, all herbivorous, and the carnivorous Cerato- 
saurus, from the Jurassic; with Claosaurus and Triceratops, 
herbivores from the Cretaceous. These American forms, with 
the four from Europe already shown to you, complete the series. 
represented on this chart. They form an instructive group of 
the remarkable Reptiles known as Denosauria. 
The geological positions of Compsognathus and of Scelido- 
saurus are fully determined, but that of Hypsilophodon 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 corre- 
sponding 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. 
Piate V.—Outline restoration of the skeleton of Compsognathus longipes, Wagner. 
One fourth natural size. Jurassic, Bavaria. 
Piate VI.— Outline restoration of the skeleton of Scelidosaurus Harrisonti, Owen. 
One-eighteenth natural size. Jurassic, England. 
PLATE VII.—Outline restoration of the skeleton of Hypsilophodon Foutt, Huxley. 
One-eighth natural size. Wealden, England. 
Puate VIII.—Outline restoration of the skeleton of Jgwanodon Bernissartensis, 
Boulenger. One-fortieth natural size. Wealden, Belgium. 
* A copy of this plate will appear in the next number of this Journal. 
