2l6 



that the ears of the Rhinoceros and the Armadillo are singularly 

 alike. Then if we turn to fossils, we find that the Polacanthus has 

 a bony pelvic shield rising in knobs, 1 not unlike those of the hide- 

 shields of the Indian Rhinoceros (Fig. 77). This is what Nicholson 

 and Lydekker say of it (p. 1161): ' In Polacanthus of the same 

 (Wealden) beds, we have a remarkable form (of Dinosaur), in which 

 the dermal armour constitutes a complete solid carapace over the 



FIG. 77. Indian Rhinoceros (R. Unicornis), from a photograph, F. G. O. S. 20046. 



whole of the dorsal aspect of the lumbar region, some of the com- 

 ponent scutes being tuberculated, and others ridged ; while there 

 was also a number of detached flattened spines somewhat like 

 those of Hyaeosaurus, which probably formed a line in the dorsal 

 region. This peculiar type of carapace forcibly recalls that of the 

 Glyptodont edentates.' 



In order to emphasise the similarity of the Rhinoceros and the 



1 See Fig, 63 (a). 



