THE 



GEOLOGICAL MAGAZINE 



NEW SERIES. DECADE IV. VOL. I. 



No. v.— MAY, 1894. 



OE,I(3-I35r.A.Xi .A.I^TIOLES. 



I. — Eestoration op Camptos/lurus. 



By Prof. 0. C, Marsh, Ph.D., LL.D., F.G.S., etc. 



(PLATE VI.) 



THE Jurassic deposits of Western North America contain the 

 remains of many gigantic Dinosaurs, and various skeletons 

 of these have been obtained by the writer, who has described the 

 more important forms. Kestorations of the skeletons of three of 

 the most interesting genera, Brontosaurus, Stegosaurus, and Cerato- 

 saurus, have already been given in the American Journal of Science 

 and in this Magazine, and another of these huge reptiles is thus 

 represented on Plate VI. accompanying the present article. Each 

 of the three forms previously restored was a typical member of 

 a distinct group of the Binosauria, and this is true, although in a 

 less degree, of the present genus, Camptosaurus. Kestorations of 

 Anchisaurns from the Triassic, and Claosaurus and Triceratops from 

 the Cretaceous, all Dinosaurs of much interest, have likewise been 

 published by the writer in the American Journal^ and in this 

 Magazine. 



The restoration here given is based upon the type specimen of 

 Camptosaurus dispar, one of the most characteristic forms of the 

 great group Ornithopoda, or bird-footed Dinosaurs. The reptile 

 is represented on Plate VI., one-thirtieth natural size. The position 

 chosen was determined after a careful study not only of the type 

 specimen, but of several others, in excellent preservation, belonging 

 to the same species or to others nearly allied. It is therefore 

 believed to be a position frequently assumed by the animal durino- 

 life, and thus, in some measure, characteristic of the genus Cainpto- 

 saums. The present species, when alive, was about twenty feet 

 in length, and ten feet high in the position here represented. 



The genus Camptosaurus is a near ally of Iguanodon of Europe, 

 and may be considered its American rej)resentative. Camptosaurvs, 

 however, is a more generalized type, as might be expected frona 

 its lower geological horizon. It resembles more nearly some of 

 the Jurassic forms in England, generally referred to Iguanodon, but, 

 as these are known only from fragmentary specimens, their generic 

 relations with Camptosaurus cannot now be determined with certainty. 



1 American Journal, vol. xli. p. 339, April, 1891 ; vol. xlii. p. 179, August, 1891 ; 

 vul. xliv. p. 343, October, 1892 ; and vol. xlv. p. 169, February, 1893. 



DECADE IV. VOL. I. NO. V. 13 



