APPENDIX 



Art. XLII. — Restorations of Gcaosaurus and Ceratosaurus / 

 by O. C. Marsh. (With Plates VI and VII.) 



A number of restorations of Dinosaurian reptiles have been 

 recently made by the writer for the United States Geological 

 Survey, and reduced figures of several of these have 

 already appeared in this Journal ; namely, Brontosaurus and 

 Stegosaurus from the Jurassic, and Triceratops from the 

 Cretaceous.* Two others of interest are given in the present 

 article ; Claosaurus from the Cretaceous, and Ceratosaurus 

 from the Jurassic, as shown on Plates VI and VII. The 

 former is a gigantic herbivorous reptile, a typical member of 

 the Ornithopoda, and the latter a large carnivorous form of 

 the Theropoda, as these orders have been defined by the 

 writer, f Each of these two reptiles is a characteristic example 

 of the great order in which it belongs, but both are highly 

 specialized, and present many features not seen in earlier and 

 more primitive types. Their representatives in the old world 

 are Iguanodon and Megalosaurus, although each of the four 

 genera may represent a distinct family. 



It is especially fortunate that each of the restorations here 

 presented is based upon the remains of a single individual in 

 which both the skull and skeleton were found in position, and 

 in remarkable preservation. Additional remains, apparently 

 identical with each, have also been secured, and these have 

 cleared up several points which otherwise might have been 

 left in doubt. These various remains have already been 

 described by the writer, and the most important parts figured. 



*This Journal, vol. xli, p. 339, April, 1891; and vol. xlii, p. 179, August, 1891. 

 f Ibid., vol. xxi, p. 423, May, 1881 ; and vol. xxiii, p. 84, January, 1882. 



Am. Jour. Sci. — Third Series, Vol. XLIV, No. 262. — October, 1892. 

 23 



