1889.] ANATOMY OF RHINOCEROS SUMATRENSIS. 23 
inserted into tibia; the lower part (about half) was covered by 
flexor communis digitorum. 
Great importance is attached by Dr. G. E. Dobson * to the presence 
or absence of a connection in the foot between the flevor communis 
digitorum and the flewor brevis; we have shown that this connection 
exists in Rhinoceros, which therefore forms no exception to the rule 
laid down by that anatomist. 
Hind foot (inner surface) of Rhineceros sumatrensis. 
P.J., peroneus longus; P, peronii; Gas¢7., gastrocnemius; Hat./.dig., extensor 
longus digitorum; F/.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 a there is 
no separate Tibialis posticus. 
The Peronei of the Rhinoceros are, on the other hand, fe 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. 
2 “ Onthe Homologies of the long Flexor Muscles &e.,” Journ, Anat. Phys. 
vol. xvii. p. 142. 
