334 MESSES. B. C. A. WINDLE AND F. O. PARSONS OX [Mar. 7, 



tendon to the rudimentary pollex. Orycteropus (35, 37) has 

 condylo-uhiar and central parts, also radial and ulnar. The 

 common tendon, which possesses no sesamoid, gives off four 

 tendons. 



Lmnhricalcs. — Amongst the Brach/podiche, Bradi/pus (1, 2, 3) is 

 devoid of any of these muscles, but Cholcepus (9) has two, one for 

 each digit. In the Mynnecophagidee two specimens of Myrmecopliaga 

 (11, 12) had four muscles, whilst another (13) had only two. 

 Tamandua (14) had three, that for the index being absent, but in 

 another specimen (16) there were six. In Oydotlmrus two speci- 

 mens (18, 20) had two lumbricales, whilst another (17) had none 

 at all. Dasyjjiis (22, 23, 24) possessed none at all. In Chlamy- 

 dophunis Hyrtl (28) failed to find any ; but in another specimen 

 (27) seven slender fleshy bundles are described as rising from the 

 sesamoid cartilage in the flexor tendon, which are inserted into 

 each side of the middle phalanges of all the digits except the 

 poUex. In Maiiis the number is very variable ; there were three 

 in (30), four in (32) and (34), and two in (33). In all the specimens 

 of Orycteropus of which we have records (35, 36, 37) there were 

 four. 



Pronator qvadratus. — Amongst the Bradypodidce this muscle is 

 very small, both in Bradyjms (1, 2, 3, 5) and Clwlcepus (8, 9, 10), 

 occupying in the former only one-eighth to one-sixth of the fore- 

 arm. The Myrmecophayidcp, viz. Myrmecophcuja (12, 13), Tamandua 

 (14), and CyclotJmrus (17, 18, 20), have the muscle extending over 

 the whole length of the interosseous space. In Myrmecopihaga 

 (12), Pouchet notices that the lower third of the muscle corre- 

 sponds to the human pronator quadnitus in being attaclied to the 

 surfaces of the radius and ulna, whilst the upper two-thirds is 

 attached only to the opposed margins of the bones. In the Dasy- 

 podidie and Manidoi the muscle is usually absent, this being the 

 case in Dasypus (22, 23), Chlamydop)Tiorus (28), and -/l/ams (29, .30, 

 31, 32, 33, 34). In Tatusia (25, 26) it was extremely rudimentary, 

 and in one specimen of Chlamydopliorus (27) it was represented 

 by a feeble fibrous cord. In Orycteropus (35) it occupied the 

 whole length of the bones, as was the case in \kQ Myrmecophagidce, 

 though Humphry describes it as being small. 



Supinator lonrjus. — This muscle is always pi-esent in the Brady- 

 podidLe and is often double. Of four specimens of Bradypus, three 

 (2, 4, 5) had the muscle delaminated into a superficial and a deep 

 layer, both of which arose from the supracondylar ridge, the more 

 superficial being inserted lower down than its deeper fellow. In 

 the other three specimens (1, 3, 6) the muscle was single and rose 

 from the lower half of the humerus. In the last of these (6) 

 the supinator longus and pronator radii teres joined before their 

 insertion. The bilaminar condition of the supinator longus was 

 found in all three specimens of CJioloepus of which we have records 

 (8, 9, 10). In 9 the superficial layer was inserted into the fascia 

 over the wrist, the deep into the radius. In the other sj)ecimeus 

 (8, 10) both parts were attached to the radius. In the Myrnieco- 



