:6 4 



CLASS REPTILIA. 



Nodosaurus, of the Laramie, is a form more or less nearly allied 

 to Stegosaurus, characterised by the completeness of the dermal 

 armour, which consists of rows of rounded knobs, becoming small 

 and quadrangular near the head. The skull is unknown. 



Finally, the remarkable genus Stenoflelix, from the German 

 Wealden, should perhaps find a position somewhere in this neigh- 

 bourhood, although it differs from all other members of this sub- 

 order by the presence of cavities in the centra of the caudal 

 vertebrae. 



Suborder 2. Theropoda. — The suborder Theropoda holds in 

 some respects a position intermediate between the Ornithopoda 



Fig. 1064. — The left side of the pelvis of Allosmirus fragilis ; from the Upper Jurassic of 

 North America. One-twelfth natural size. z7, Ilium ; is, Ischium ; /, Pubis ; a, Acetabulum. 

 (After Marsh.) 



and the Sauropoda, although its members are more nearly allied 

 to the latter ; with which, as already mentioned, it has been pro- 

 posed to group them, under the name of Saurischia. In many 

 respects, such as the structure of the teeth, the form of the fe- 

 mur, the occasional presence of only two sacral vertebrae, and 

 the form of the quadrate bone, certain members of this suborder 



