THE EXTREMITIES OF ORYCTEROPUS CAPENSIS. 579 



separe par le nerf cubital." This muscle, moreover, scuds upwards from its posterior 

 part a peculiar offset, " gros comme le doigt environ," which covers the ulnar nerve, and 



runs parallel with it. It then bends towards the inner border of the humerus, in its 

 passage across the brachial vessels, and, at about the middle of the arm, is suddenly 

 continued as a delicate tendon, which spreads out and fixes itself upon the surface of 

 the tendon of the short portion of the biceps. More details of the comparative anatomy 

 of the epitroclileo-anconeus will be found in my paper on Dasypus sexclnctus. 



Pronator teres. — A strong, \v r ell-developed muscle, arising from the upper portion of 

 the inner border of the internal condyle, immediately above the origin of the extensor 

 carpi radlalis. It gradually broadens outwards towards its insertion into the distal half 

 of the radius, along the strong external or dorsal ridge of this bone. 



This muscle has a great similarity to its homologue in Dasypus, and, like it, does not 

 derive any of its origin from the coronoid process of the ulna l . 



Supinator brevis. — This muscle, as in Dasypus, had only its humeral origin; it had, 

 however, proportionally a much better development. It was inserted along the <>uter, or 

 dorsal, ridge of the radius, for fully half the length of the bone, but stopped short a 

 little in advance of the posterior portion of the insertion of the preceding muscle. 



According to M. Pouchet's description and figure, this muscle in M.jubata retains 



only its humeral origin 2 . 



Supinator longus. — This muscle, which is absent in Dasypus, is very well represented 

 in the forearm of the Orycteropus. It has a very extensive origin, from nearly the whole 

 extent of the posterior surface of the humerus, in the middle line, beginning as high up 

 as the neck of the bone, and terminating upon the " supinator ridge," soon after the 

 commencement of this latter. It covers at its origin the whole extent of origin of the 

 brachialis anticus, and is, in turn, at its origin, covered by the external head of the 

 triceps, and, at its lowest part, by the fibres of origin of the extensor carpi radialis 



The muscle, having started upon its 



considerably, but preserves a 



uniform breadth and uniform character, as a flat slip of tolerable thickness, till it reaches 

 its insertion along the distal extremity of the radius, the middle portion being inserted 

 by a tendon into the strong tubercle in which the dorsal 3 ridge terminates, while the 

 lateral portions are lost in a kind of aponeurosis, which covers the tendons of the principal 

 flexors as they pass into the region of the carpus, and is also extended as a kind of fascia 

 over the dorsum of the wrist. The outer half, moreover, of its terminal portion is fused 

 with the annular ligament, which bridges over the three tendons of the extensor com- 

 munis as they pass on to the dorsum of the carpus. This termination is very well repre- 

 sented by Cuvier in one of his plates 4 . 



The presence, merely, of the supinator longus in JK. tamandua is mentioned in Rapp's 

 monograph ; but Pouchet makes no reference to it in his work upon the Great Anteater. 



According to Meckel 5 , this muscle has a very great development in the Ai, and is, in 



1 Dr. Macalister " On the Nature of the Coronoid Portion of the Pronator Radii Teres," Journ. of Anat. and Phys 

 2nd ser. (Camhr. 1867), vol. i. p. 9. ' Op. cit. p. 10, and pi. ii. fig. 3. 



forearm is fully 



• Op. cit. pi. 254. fig. 2. 



5 Op, cit. p. 534. 



