1885.] MYOLOGY OF THE WATER-OPOSSUM. 9 



from both coracoid and glenoid, the gleiio-uhiar arising from glenoid 

 alone. The former is inserted into radial tubercle ; the latter is 

 inserted with brachialis antiens into coracoid process of ulna. 



Triceps. — Arises by three heads. Long one arises from lower 

 part of posterior border of scapula, by tendon in its lower two thirds, 

 and in its upper third by muscular til)res, which pass obliquely on to 

 outer aspect and are inserted into tendon. Iiuier and outer heads 

 partly separated by musculo-spiral nerre, arising from inner and 

 posterior aspects of humerus, and from intermuscular septum 

 separating outer head from brachialis anticus. Fibres from outer 

 head pass obliquely into long head at its lower third, and partly into 

 outer side of olecranon. Most of fibres of inner head are inserted 

 into anterior part of long head, a few being inserted into inner side 

 of olecranon. Long head is inserted into tip of olecranon. 



Anconeus interniis. — Arises from back of internal condyle of 

 humerus, and is inserted on inner side of tip of olecranon. Its upper 

 fibres are continuous with inner head of triceps, being separated from 

 it by ulnar nerve. Its lower fibres are separated from flexor carpi 

 ulnaris by a fibrous septum. 



Anconeus extemus. — Arises from back of external condyle of 

 humerus. Inserted into outer side of olecrauon and outer side of 

 ulna for its upper fifth. Its upper fibres are continuous with outer 

 head of triceps. 



Brachialis anticus. — Arises from outer side of humerus in its 

 ■whole length. Inserted into ulna, just outside insertion of gleno- 

 ulnar portion of biceps. 



Pahnaris Jongus. — Arises by fleshy fibres from internal condyle 

 of humerus and lower part of supracondyloid ridge. Inserted into 

 flexor tendon in palm. Two portions of it are quite distinct from 

 main mass — one, which arises from internal condyle, and whose 

 tendon underlies principal tendon, is inserted into the lower part of 

 it ; the other leaves the inner side of the muscle and is inserted iuto 

 the inner side of its tendon. 



Flexor carpi radialis. — A thin muscle arising from internal 

 condyle of humerus. Inserted into radial side of base of metacarpal 

 of medius. 



Flexor carpi ulnaris. — Arises from internal condyle of humerus, 

 from posterior surface of olecranon, and from bridge between the 

 two, closely connected with anconeus internus. Its superficial fibres 

 form a thin belly inserted by a very thin tendon into base of meta- 

 carpal of minimus ; the remainder forms a strong tendon inserted 

 into pisiform. 



Flexor digitorum profundus. — Consists of three parts all closely 

 connected. 



Condylar portion, superficial, arising from internal condyle of 

 humerus, closely connected with flexor carpi ulnaris. 



Ulnar portion, the largest, arising from upper third of ulna and 

 outer surface of olecranon. 



Radial portion arises from upper third of radius, internal to 

 oblique line. 



