FORE-LIMB. 125 



though small flexor sublimis. It is confined entirely to the 

 hand, as in reptiles, and consists of four small bellies that 

 rise at the level of the wrist from the common deep flexor 

 tendon, and are inserted lower down into the sheaths of the 

 four inner deep tendons. 



Coues, Commun. Essex Inst., vol. vi. 1871, p. 151. 



C. 142. Superficial muscles of the right fore-limb of a Wallaby 

 (Macropus ruficollis). The musculature, in conformity with 

 the somewhat rudimentary nature of the limb, is of a very 

 feeble description, especially in the fore-arm and hand. 

 The most powerful group of muscles are the extensors o 

 the elbow. The following features are of interest : The 

 deltoid is single. There is a very strong connection 

 (" achselbogen ") between the latissimus dorsi and pecto- 

 ralis, indicating the original continuity of these muscles 

 (see No. C. 122). The coraco-brachialis brevis, as in all 

 Kangaroos, is alone present. The biceps originates by a 

 single head from the coracoid, passes superficial to the 

 shoulder-joint, and divides during the latter part of its 

 course into two distinct bellies, attached respectively to 

 ulna and radius. The supinator longus is attached to the 

 carpus. 0. C. 64 z d. 



C. 143. Left fore-limb of a Wallaby (Macropus rujicollis) showing 

 the deeper muscles. The flexor sublimis rises about the 

 middle of the forearm from the surface of the flexor pro- 

 fundus. 0. C. 64 z e. 



Parsons, Jour. Anat, & Physiol., vol. xxxii. 1898, p. 125. 



C. 144. Left fore-limb of a Koala (Phascolarctus cinereus), show- 

 ing the coraco-brachialis, brachialis internus, and biceps 

 muscles. All three varieties (longus, medius, and brevis) of 

 the coraco-brachialis are present. The insertion of the 

 medius and longus occupies the entire distal half of the 

 inner side of the humerus. The coruco-radial and gleno- 

 ulnar portions of the biceps, as in many Marsupials, 

 are quite separate from one another ; the tendon of the 

 long head lies outside the capsule of the shoulder-joint. 

 0. C. 64 z k a. Presented by Prof. G. B. Howes. 



