1889.] 
Rhinoceros. 
Flex. obl. met. ... Origin by one head from 
flexor condyle, by a 2nd 
head partly from olecra- 
non and partly from 
humerus. Jns. (1) by a 
tendon upon pisiform ; (2) 
by fleshy fibres upon radial 
side of carpus. 
. Origin from flexor con- 
dyle. Jns. proximal end 
of radial metacarpal. 
Origin from flexor condyle. 
Ins. bases of 2nd phalanx 
of all 3 digits. 
Flexor profundus. Origin from flexor condyle. 
Ins. bases of last phalanx 
of each digit. 
Flea. int. met. 
Flex. perforatus... 
Palmaris longus (?) Present. 
Ext. met. Origin. Extensor condyle 
and radius. ns. carpal 
end of middle metacarpal. 
Rhinoceros. 
Extensor met. ...... 
Ext. comm. digit. 
txt. lat. digit. ... 
ANATOMY OF RHINOCEROS SUMATRENSIS. i 
Horse. 
Origin. By two heads as in 
Rhinoceros. 2nd head 
arises only from olecra- 
non. Insertion only on to 
pisiform. 
The same. 
The same, allowing for 
absence of phalanges of 
2nd and 4th digits. 
Origin :—(1) From flexor 
condyle; (2) olecranon ; 
(3) posterior surface of 
radius. 
Absent. 
Origin only from humerus. 
Tapir. 
Origin only from humerus. 
Origin:—(1) Outer condyle ; 
(2) head of radius; (3) 
from middle of ulna. 
Origin from extensor con- 
dyle and from ulna and 
radius. Jnsvrtion, outer 
digits 3 and 4. 
It will be seen from the above tabular comparison of some of the 
muscles of the Rhinoceros with the corresponding muscles of the 
Horse that there are some differences, particularly in the extensors. 
We shall now compare the myology of Rhinoceros with that of 
Hyrax; our comparison is not based upon a dissection of Hyrax, 
but upon the detailed account of the muscular anatomy of that 
animal by Messrs. Murie and Mivart’. 
The extensor muscles of the manus in Rhinoceros are, as in the 
Horse, only four in number; the corresponding muscles in Hyrax 
appear to be as follows :— 
Rhinoceros, Horse. Tyrax. 
Extensor communis digitorum. 
Extensor lateralis digitorum. 
Extensor obliquus metacarpi. 
Extensor communis digitorum. 
Extensor minimi digitt. 
Extensor ossis metacarpi pollicis. 
{ Extensor carpi longior. 
Extensor metacarpt. . . 
P Extensor carpi brevior. 
1 P.Z.S. 1865, p. 329. 
Proc. Zoo. Soc.—1889, No. IL. 2 
