112 STUDIES IN THE EVOLUTION OF ANIMALS 



may have become partially eroded. Indeed, in some fragments, 

 the platelets are almost wholly defaced, as shown in Fig. 62 {b). 

 But I think that any unprejudiced evolutionist will not fail to see 



Fig. 62. — Bone-rosettes from other species: (a) from carapace ai Hoplof horns; (li) from 

 carapace of H. Megeri ; [c) from fragment of a Hoplophorus (Natural History Museum). 



in them the ' blocks,' so to speak, from which the Jaguar got its 

 imprints ! 



Moreover, on the pelvic shield of Polacanthus Foxii, Fig. 63 

 («), the remains of a Stegosaur in the Natural History Museum, 

 and on the tail armour of a Hoplophorus, {b) we find armour-plates 



