20 GUIDE TO THE FOSSIL REPTILES, AMPHIBIANS, FISHES. 
Wall-cases 
4, 5. 
Table-case 
16. 
Case M. 
Wall-ease 
5. 
Sub-order 2.— Stegosauria. 
The armoured Dinosaurs or Stegosauria (“ plated-lizards ”) 
are shown by their teeth to have been herbivorous, and they 
resemble the next sub-order, Omithopoda, so closely that 
they are often grouped with the latter. The latest members 
of the tribe, discovered in the Upper Cretaceous of Wyoming, 
are the most heavily built, with a large horned head and a bony 
frill over the neck ( Triceratops and Sterrholophus, Tig. 14); 
Fig. 14. —Skull and mandible of a horned Dinosaur (Sterrholophus fldbel- 
latus), left lateral view, from the Cretaceous of Wyoming, U.S.A.; 
about one-twentieth nat. size. a. nostrils ; b. orbit; c. supratemporal 
vacuity; e. small bony plates round the occiput; h. the left horn-core 
of the pair above the eyes; hj horn-core on nose; p. predentary bone; 
q. quadrate bone ; r. rostral bone. (After 0. C. Marsh.) 
but there are no remains of these reptiles in the Museum. 
The American Jurassic Stegosaurus, with small head, is also 
well armoured with large bony plates and spines on the 
trunk. Its skeleton is closely similar to that of Omosaurus, 
of which fine specimens are exhibited in Wall-case 5. The 
hip-region and other remains of Omosaurus armatus, from the 
Kimmeridge Clay of Swindon, are especially noteworthy. In 
the same Wall-case there are also the original specimens of 
Hylceosaurus, obtained by Mantell from the Wealden of 
