Vol. XIV 

 1914 



'•] Leach, The Myology of the Bell-Magpie. ig 



passes through the humero-uhiar pulley, forms the fleshy mass 

 of the under side of the arm, becomes a very strong tendon, and 

 is inserted directly into the ulnare ossicle. The upper part 

 arises as a strong tendon from the internal condyle of the humerus 

 outside the humero-ulnar pulley, and, becoming fleshy, runs 

 parallel to, and closely bound with, but (except for a tendinous 

 connection) remaining distinct from the main part of the muscle. 

 Its fine tendon runs on above the strong tendon of the main part 

 and behaves as Shufeldt stated for ,the branch that he described 

 as arising from the main tendon before it was inserted on the 

 ulnare ossicle. The tendon of the upper part runs on in a sheath 

 above that of the lower part ; it passes above the ulnare ossicle 

 and across the metacarpal to join the tendon of the flexor digitorum 

 profundus (82). 



Gymnorhina, Cracticits, and the Australian Raven agree with 

 Strepera in having the upper part (except for the tendinous con- 

 nection) distinct from the lower part. 



A superficial fascia with muscle fibres about the elbow arises 

 from near the tendon of the lower part of this muscle. A branch 

 is given off to each secondary, as figured by Gadow on plate xx.a, 

 fig. I, of the work before mentioned. 



84. The flexor carpi iilnaris brevior [26] agrees in Strepera with 

 the same muscle in the American Raven as described by Shufeldt. 

 It arises beneath (82) from the middle third of the upper side of 

 the ulna, becomes tendinous, and runs directly above the tendon 

 of (82) to the carpus. Its tendon winds round in front of the 

 radiale bone to be inserted upon the outer edge of the top of the 

 carpo-metacarpiis. 



VI.— The Muscles of the Hand. 



Shufeldt names these as follow : — 



85. The extensor proprius pollicis. 



86. The flexor brevis pollicis. 



87. The flexor minimi digiti. 



88. The flexor minimi digiti brevis. 



89. The abductor minimi digiti. 



90. The flexor metacarpi brevis. 



91. The interosseous dorsalis. 



92. The interosseous palmaris. 



In Strepera these muscles agree closely with Shufeldt's careful 

 description of them as they occur in the Raven. 



85. The extensor proprius pollicis [28] is a neat muscle, well 

 suited for extending the thumb. It arises from the ulnar side 

 of the tendon of the extensor metacarpi radialis longior (73), 

 becomes tendinous, and is inserted into the antero-ulnar side of 

 the pollex. 



86. The flexor brevis pollicis [28] arises fleshy from the side of 

 the metacarpal, becomes tendinous, and is inserted into the apex 

 of the pollex. 



