1885.] 



MYOLOGY OF THE WATER-OPOSSUM. 



It 



Sujiittafor brevis. — Arises from external condyle of humerus. 

 Its upper fibres pass in a sling-like manner round head of radius, 

 whilst its lower fibres pass obliquely downwards and inwards and 

 are inserted into surface of radius external to its oblique line. 



Muscles of Hand. 



Dorsal (/roup. — Abductor pollicis.— Ansmg from annular liga- 

 ment, trapezium, and scaphoid, slightly united at its origin with 

 flexor brevis pollicis ; inserted into outer side of base of first phalanx 

 of thumb. 



Abductor minimi digiti. — Much larger than preceding, arising by 



O.ir 



S.Sp 



S.M R 



B 



C.JB 



CM CO 



Myology of Water-Opossum. 



i?., rlioinboideus ; S.M., serratus magnus ; D., deltoid ; T.Ma., terea major; 

 O.//., omo-hyoid ; O.a., omo-atlantic ; S. S/J., supra-spinatus ; /.«., infra- 

 spinatus; 7yj., trapezius; r.iV/., teres minor ; 7V., triceps; Z..S., levator 

 scapiJae; Sh., subclavius ; CM., cleido-mastoid ; CO., cleido-occipital ; 

 CB., coraco-bracbialis ; Bi., biceps. 



two heads from annular ligament and pisiform. Insetted into base 

 of first phalanx of minimus. 



First dorsal interosseous. — Arises from palmar surface of meta- 

 carpal of thumb. Inserted into radial side of first phalanx of index. 



Second dorsal interosseous. — Arises from radial side of base of 

 metacarpal of medius, and ulnar side of metacarpal of index in its 

 whole length. Arched tendon, the larger end being inserted into 

 radial side of base of first phalanx of medius, and the smaller end 

 passing on to p.«)lmar surface of metacarpal of index. 



