196 DINOSAURS OF NORTH AMERICA. 



One of the best-preserved specimens of the Stegosauria in Europe 

 was described by Owen, in 1875, as Omosaurus armatus, and the type 

 specimen is in the British Museum. It is from the Kinimeridge clay 

 (Upper Jurassic) of Swindon, England The skull is wanting, but the 

 more important parts of the skeleton are preserved. Various portions 

 of the skeleton of several other individuals have also been found in 

 England, but the skull and teeth still remain unknown. 



Another genus of the Stegosauna, representing a distinct family, is 

 Scelidosaurus, established by Owen in 1859, from the Lias of England. 

 The greater part of the skeleton is known. A restoration in outline, 

 made by the writer for comparison with that of Stegosaurus, is shown 

 on PI. LXXXIII. The Euskelesaurus of Huxley, 1867, from the Trias 

 of South Africa, is apparently a member of this group. 



( AAITTOSA URIDJ!. 



Another important family of Jurassic Dinosaurs is the Camptosau- 

 riche, so named from the type genus Camptosaurus, described by the 

 writer in 1879, the type specimen being from the Atlantosaurus beds 

 of Wyoming. This genus includes several species of herbivorous 

 dinosaurs, which belong to the true Ornithopoda, or bird-footed forms. 

 The species were all bipedal, with the fore limbs much smaller than 

 those behind, and all the limb bones light and hollow. The head was 

 comparatively small, the neck of moderate length and quite flexible, 

 and in life the animals were evidently agile and graceful in movement. 

 Some of the smaller species were quite bird-like in form and structure. 

 The three American genera, Camptosaurus, Dryosaurus, and Laosau- 

 • rus, are all from the same general horizon. 



CAMPTOSAURUS. 



The large dinosaur described by the writer as Camptosaurus dispar, 

 of which a restoration is given on PI. LVI, is now so well known that 

 it may be taken as .a form typical of the group. It is exceeded iu size 

 by Camptosaurus amplus Marsh, but there are at least two smaller 

 species of the genus (C. medius and C. nanus). So far as at present 

 known these species are found iu successive deposits of the same gen- 

 eral horizon, the smallest below and the largest above. 



Camptosaurus amplus is represented by remains which show that this 

 reptile when alive was about 30 feet in length. The type specimen 

 of C. dispar was about 20 feet iu length and 10 feet in height. 

 C. medius was about 15 feet long. The smallest species of the 

 genus, C. nanus, was not more than 10 feet in length, and perhaps 

 6 feet in height when standing at rest. One of the striking features 

 of this diminutive species is its long sigmoid scapula, shown in fig. 2, 

 PI. LY. This is in strong contrast with the short, straight scapula 

 of C. dispar, seen on PI. LIV, fig. 1. The limb bones of all the species 

 of this genus are very hollow. 



