2i8 STUDIES IN THE EVOLUTION OF ANIMALS 



a Newfoundland Dog. The specimen is hidden by the larger ones, 

 and jamrned in among them, so that it is not easy to examine it 

 thoroughly.'' It has no horns, or perhaps only a rudimentary one 

 on its nose. It may be a young one of R. Sondaicus (?) Of 

 whatever species it may be, it presents quite a revelation as to the 

 points I am discussing. It has the scapular and pelvic shields 

 somewhat like those of the Indian Rhinoceros (i?. Unicornis), but 

 the whole surface is covered with small plates, which vary as to 

 their component platelets. 



In Fig. 78 I have given two variants taken from the posterior 

 aspect of the left haunch of this Rhinoceros. Its plates appear to 

 be of some bony substance. 



Fig. 78. — [a\ and [h] Bony plates from haunch of small Rhinoceros, Natural History 

 Museum (R. Sondaicus'!) ; (c) bony plate of Tolypentes tricincta (an Armadillo). 



This is not all, for in one or two places the plates have fallen 

 off, showing that they are something quite distinct from the 

 dermal tissue proper ; and what may perhaps be of some import- 

 ance, the detachment of the plates has left an impression of their 

 component platelets on the subjacent skin. 



Some of the plates of this little Rhinoceros, like {a), do not 

 differ materially, although they do in outline, from those of one of 

 the Armadillos {Tolypentes tricincta), shown in {c). Then {p) in 

 its component platelets is not unlike a Jaguar rosette. 



■* Its position has been recently altered. 



