1876. J MR. F.J. BELL ON MOSCHUS MOSCHIFERUS. 183 



In Tragulus a similar arrangement obtains. In Hyomoschus, how- 

 ever, Chatin notes three muscles in this region, which he names ex- 

 tenseur gros, extensevr grele, and adducteur. The adducteur appears 

 to be the same as the oblique extensor, so far as one can judge from 

 Chatin's account ; he does not, however, note the oblique direction of 

 its tendons, which seems to be universal among the Ungulata, as it is 

 found in Equus, Ovis, Cervus, and Sus. 



The anterior extensor arises by two heads barely separable from 

 one another, on the outer face of the distal portion of the humerus ; 

 and from Chatin's description and figure I am led to suppose that 

 he has divided this, which is really one muscle, into a portion "gros," 

 and a portion " grele." 



The tendon is only double at its distal extremity, where it widens, 

 and becomes bifid, to embrace both sides of the tuberosity of the me- 

 tacarpus. 



ft. Posterior face. 



(1) Flexor metacarpi internus. 



(2) ,, ,, obliquus. 



(3) ,, ,, externus. 



Here, again, there is no important variation; but we may note that 

 the outer branch of the bifid tendon of the external flexor (3) is in- 

 serted into the tuberosity on the external side of the metacarpus, which 

 appears as the proximal end of the fifth metacarpal, united to the rest 

 of the bone in this region, and only represented distally by a short, fine 

 needle of bone ; a similar insertion of the tendon was seen in Cervus 

 virginianus ; in the Sheep the ending is more towards the median line 

 of the metacarpus, while in Tragulus, Hyomoschus, and the Pig this 

 branch is attached to the head ot the entire fifth metacarpal. 



B. Muscles inserted into the phalanges. 

 «. Anterior face. 



In the arrangement of the tendons of muscles going to the digits, 

 Moschus differs not a little from Cervus virginianus, or the Pig. In 

 the former, as in the Sheep, we find that there are three muscles 

 having their insertions in the digits, namely : — 



i. Extensor communis, with tendons to the third phalanges of the 



median digits, 

 ii. Extensor digiti intend (tertii). 

 iii. ,, ,, externi (quarti). 



Both of these have two branches — one to the second phalanx, and 

 one directed backwards and ending in the plantar cushion — but no 

 tendons going to the lateral digits, although those ending on the 

 plantar surface, as just described, probably represent what remains 

 of them. 



C. virginianus, in addition to the muscles common to it and the 

 Sheep, possesses an extensor dig. minimi. 



