470 



DISTRIBUTION IN SPACE AND TIME 



presents some points of resemblance to birds, probably due to 

 their having been adapted to the same kind of locomotion on 



Fig. 1328. Stegosaurus (much reduced) 



the ground. These limbs were relatively very long, and they 

 were also digitigrade, i.e. the animals possessing them walked on 

 tiptoe. The best - known member of the group (Iguanodon, 



fig. 1329) inhabited England, 

 Belgium, and Germany during 

 the second half of the Meso- 

 zoic epoch, and the larger of 

 the two known species was 

 nearly 30 feet in length. The 

 Horned Dinosaurs (Ceratop- 

 sia)i which were among the 

 later forms of the epoch, in- 

 cluded a remarkable herbiv- 

 orous creature ( Triceratops] 

 over 20 feet in length, with 

 three horns on the head, and 



p, pubis produced back into post-pubis (pp}\ is, ischium; 

 l-iv (in hind-limb), ist to 4th toes. 



Fig. , 3a9 ._ Iguanodon (much reduced). ^.Scapula; CUr i OU S bony shield 



co, coracoid; I and v (in fore-limb), thumb and little finger; J 



neck. 



Flying Reptiles (Ptero- 



saurid}. The organs of flight of these extraordinary animals 



have elsewhere been described (see vol. iii, p. 308). Some 

 were of small size, and of these the Pterodactyles (Pier odacty Ins, 



