8o EXTINCT MONSTERS. 



well as the length of stride they indicate, is against the idea ol 

 their having been made by birds. Some of them, for instance, are 

 twenty inches in length, and four or five feet apart ! The foot of 

 the African ostrich is but ten inches long, so we must fall back on 



FIG. 14. Portion of a slab of New Red Sandstone, from Turner's Falls, 

 Massachusetts, U.S., covered with numerous tracks, probably of Dinosaurs. 

 This specimen is now in the Natural History Museum. The separate tracks 

 are indicated by the numbers. (After Hitchcock.) 



the Dinosaurs for an explanation. However, it is quite possible 

 that some of the smaller impressions were made by birds. 



There is at South Kensington a fine series of these and other 

 specimens of fossil footprints (Gallery No. XL, Wall-cases 8-ic). 

 The surface of one large slab in the geological collection is eight 



