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Show 1905.J ANATOMY OF THE LEATHERY TURTLE. 305 completely separate 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 metacarpal V. and the pisiform. I saw 110 signs of a humero-digiti I.-V. dorsalis (extensor communis). Ubia-carpo-ulnaris(text-figs. 62 & 63. 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 Clielonia, but from its position and attachments is evidently an extensor carpi ulnaris. Text-fig. 63. Dermochelys coriacea, muscle-attachments upon the extensor surface of the forearm and hand. 55. Humero-radialis longus dorsalis, 56. Humero-carpali-metacarpalis I., 59. Ulna-carpo- nlnaris, 60, 61. Ulna-carpo-radialis + carp. dig. I .-V ., 63. Humero-carpali- ulnaris, X ulna-carpalis, Y intrinsic muscles of hand. ( Llna-carpalis) (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 origin of carpali-digiti V. This is a small muscle running diagonally towards the little finder. 1 could find nothing in Bronn to correspond with it, so have called it ulna-carpalis. Humero-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 superficial to the tendon of the humero-antebrachialis inferior. Humero-carpali-ulnaris (text-figs. 62-64. 63).-Origin : from the ulnar border of the humerus proximal to the origin of the 20* |