552 MR. J. BESWICK-PERRIN ON THE [June 20, 



hut in no instance have they exhibited so complete and isolated a 

 character as in the Kinkajou. 



In the Caracal, Paradoxurus, and Dog the short variety of the 

 coraco-brachialis only is represented, the long variety being absent. 

 In the three latter animals the so-called biceps is a monogastric 

 muscle, the long head alone being present. In this respect the Kin- 

 kajou presents a remarkable difference from the Dog, tbe Caracal, 

 and the Paradoxurus typus, exhibiting a much higher grade of mus- 

 cular development, and approximating more closely to the Primates. 

 As regards the insertion of the biceps in the Dog, it is not always 

 confined to the radius. I found it inserted into both the radius and 

 ulna in a mongrel specimen. 



Brachialis anticus. This muscle is very large and fleshy. It 

 arises from the delto-pectoral ridge and upper half of the shaft of 

 the humerus below this ridge. It is inserted into the coronoid pro- 

 cess of the ulna. It has a similar arrangement in the Caracal and 

 Paradoxurus typus. In the Dog the brachialis anticus is sometimes 

 represented by an exceedingly small muscle which arises from the 

 anterior surface of the lower end of the shaft of the humerus, instead 

 of the more extensive attachment usually ascribed to it. 



The pronator radii teres is a monogastric muscle. It arises from 

 the inner humeral condyle below the epicondyloid foramen. It is 

 inserted into a rough impression on the outer surface of the shaft of 

 the radius, and into the bone for some distance below this point. It 

 has a more extensive radial attachment in the Paradoxurus. 



Palmaris longus externus arises by a pointed tendinous process 

 from the internal humeral condyle, and from the septum between it 

 and tbe adjacent muscles. It is inserted into the anterior annular 

 ligament and palmar fascia ; the latter is very thin, but disposed as 

 in the human subject. 



Palmaris longus interims is a fusiform muscle. It arises from 

 the fascia covering the flexor carpi ulnaris, by a pointed tendinous 

 process, about three quarters of an inch below the internal humeral 

 condyle. It is inserted into the anterior annular ligament close to 

 the pisiform bone ; it is also partly continuous into the flexor brevis 

 minimi digiti. This muscle may be regarded as a differentiated por- 

 tion of the flexor carpi ulnaris ; it is entirely supplied by the ulnar 

 nerve. In the Caracal and Paradoxurus there is only the usual 

 palmaris longus. 



The flexor carpi radialis and flexor carpi ulnaris are like the cor- 

 responding muscles in the human subject. The ulnar nerve and the 

 recurrent ulnar artery pass between the two heads of the latter muscle. 



The flexor sublimis digitorum arises musculotendinous from the 

 internal humeral condyle, coronoid process, and their connecting 

 ligament. About half an inch below its origin it divides into a central 

 and two flanking muscles. The two latter terminate in short tendons, 

 which are inserted into the front and lateral aspects (one on each 

 side) of the flexor profundus digitorum tendon, opposite the wrist- 

 joint. The mesial portion divides into four tendons : three of these are 

 superficial ; but the fourth occupies the posterior aspect of the muscle, 



