1889.] 



ANATOMY OF RHINOCEROS STJMATRENSTS. 



23 



inserted into tibia ; the lower part (about half) was covered by 

 flexor communis digit arum. 



Great importance is attached by Dr. G. E. Dobson ' to the presence 

 or absence of a connection in the foot between the ^e.ror communis 

 digitorum and the^e.i'or hrevis ; we have shown that this connection 

 exists in Rhinoceros, which therefore forms no exception to the rule 

 laid down by that anatomist. 



Fig. 9. 



Hind foot (inner surface) of lihinooeros sumah-ensis. 



P.l., peroneus longus ; P, peronii ; Gastr., gastrocnemius; Ext.l.dig., extensor 

 longus digitorum ; Fl.d., flexor longus digitorum. 



These flexor muscles agree very closely with those of the Horse 

 and of the Tapir ; in both these Ungulates and in Hyrax there is 

 no separate Tibialis posticus. 



The Peronei of the Rhinoceros are, on the other hand, far more 

 complicated than in the Horse, where one only has been described. 

 In Hyrax Murie and Mivart only describe two peroneal muscles. 

 No reliable taxonomic conclusions can be drawn from the relations 

 of these muscles, since in Lepus and Hydromys the peroneals are as 

 complicated as in Rhinoceros. 



^ '■ On the Homologies of the long Flexor Muscles &c.," Journ. Anat. Phys. 

 vol. xvii. p. 142. 



