1905.] 



ANATOMY OF THE LEATHERY TURTLE. 



305 



completely sepai-ate muscle, that rises from the wrist proximal to 

 the origin of the part proper to digit II., and thence runs almost 

 directly outwards to the head of metacai-pal Y. and the pisiform. 

 I saw no signs of a humero-digiti I.-Y. dorsalis (extensor com- 

 munis). 



U'lna-car2)o-ulnaris{text-6.gs. Q2& Q3. 59). — Origin: from the 

 inner condyle of the humerus. Insertion : upon the proximal 

 edge and flexor surface of the pisiform and to most of the inner 

 surface of the ulna. 



This does not agree in detail with Hoffmann's description of the 

 muscle in other Chelonia,, but from its position and attachments 

 is evidently an extensor carpi ulnaris. 



Text-fig, 63. 



iise 



Dermoclielijs coriacea, muscle-attachments upon the extensor surface of the 

 forearm and liancl. 



55. Humero-radialis longus dorsalis, 56. Humero-carpali-mctacarpalis I., 59. Ulna- 

 carpo-ulnaris, 60, 61. Ulna-carpo-radialis + carp. dig. I.-V., 63. Humero- 

 carpali-ulnaris, X ulna-carpalis, Y intrinsic muscles of hand. 



{Llna-carjxilis) (text-figs. 62 & 63, X). — Origin: from the inner 

 surface of the shaft of the ulna beneath the ulna-carpo-radialis. 

 Insertion : into the skin of the wrist above the oi-igin of carpali- 

 digiti V. 



This is a small muscle running diagonally towards the little 

 finger. I could find nothing in Bronn to coiTespond with it, so 

 have called it ulna-carpalis. 



Hicmet'O-radialis volaris (text-fig. 64. 62). — Origin : from the 

 flexor surface of the inner condyle of the humerus. Insertion : 

 upon the inner surface of the shaft of the radius, passing super- 

 ficial to the tendon of the humero-antebrachialis inferior. 



ff'umero-carpali-ulnaris (text-figs. 62-64. 63). — Origin : from 

 the ulnar border of the humerus proximal to the oriain of the 



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