304 MR. E. H. BURNE ON THE [Apr. 18, 



Suhscapularis (text-figs. 59, 60, & 62. 52). — Origin : from the 

 whole length of the outer surface of the scapula and pai-tly also 

 from the anterior and posterior surfaces. Insertion : along the 

 extensor surface of the humerus from the median process to the 

 origin of the anconseus. Fiirbringer gives an origin also from 

 the inner surface of the scapula. 



A muscle (text-figs. 60, 62, & 64. 52 a) I was unable to deter- 

 mine, but probablj^ a separate part of the suhscapularis. Origin : 

 from the posterior surface of the scapula (except its dorsal thii-d). 

 It passes behind the outer end of the coracoid, and is inserted 

 between the median process and the head of the humerus. 



AnconcBus. Pars ancongeus humeralis (text-fig. 62. 53). — 

 Origin : from the distal half of the extensor surface of the 

 humerus. Insertion : upon the head of the ulna. 



Fiirbringer speaks of this muscle as taking origin equally from 

 both sides of the humeinis. In my specimen, the flexor surface of 

 the humerus was occupied by the origin of the humero-radialis 

 longus dorsalis, 



Humero-radialis longus do7-salis (text-figs. 63 & 64. 55). — A 

 large but thin sheet of muscle that arises from the I'adial half of 

 the flexor surface of the humerus distal to the lateral process, and 

 extends on the radial side of the foreai-m to the wi-ist. 



The surface of the muscle is covered by a layer of dense con- 

 nective tissue, but by cutting this away three fairly distinct 

 muscle-bellies can be made out. From the ulnar side these ai-e : 



(1) a part united by fibrous tissue to the tendon of the biceps, 

 and inserted just to its radial side upon the head of the radius ; 



(2) a part extending down the flexor surface of the radius and 

 inserted about its middle ; (3) a part closely applied to the outer 

 border of the anconfeus, and inserted upon the whole of the radial 

 and part also of the extensor surface of the radius down to the 

 wrist. 



Humero-carpali'metacarpalis I. (text-figs. 62 & 63. 56). — Origin : 

 from the outer condyle of the humerus, between the anconseus and 

 the humero-radialis longus dorsalis. Insertion : upon the head of 

 metacarpal I., and to the back of the hand by a tendinous expansion 

 that runs diagonally towards the little finger. Hofimann gives an 

 insertion for this muscle in other Chelonia upon the radius and 

 carpus. 



Ulna-carpo-radialis + Cmyali digiti I.-V. dorsalis (text- figs. 62 <k 

 63. 60 -f 61 ). — Origin : from the inner surface of the ulna,, fiom the 

 ligaments of the extensor svirf ace of the wrist, and from the greater 

 part of the extensor surface of metacarpals I.-IV. Insertion : 

 by a slip into the head of metacarpal I., and by flat tendons into 

 the distal phalanges of digits I.-IV. and into metacarpal V. 



This is a thin muscle-sheet of very degenerate character, espe- 

 cially towards the ulnar side of the hand. Its tendons are bound 

 closely to the periosteum of the finger-bones and can have little 

 or no play. It corresponds fairly to the above-mentioned muscles 

 of Hofiniann. The part proper to digit V. forms, however, a 



