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Show 1 889.] 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. Dobson1 to the presence or absence of a connection in the foot between the flexor communis digitorum and the flexor 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 Rhinoceros sumatrensis. P.I., peroneus longus ; P, peronii; Gastr., gastrocnemius; Ext.I.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. 1 " On the Homologies of the long Flexor Muscles &c," Journ. Anat. Phys. vol. xvii. p. 142. |