FORE-LIMB. 121 



brachialis inferior (brachialis anticus) and outer humeral 

 head of the anconeus is a muscle (humero-radialis) that 

 passes from the lateral tubercle of the humerus to the 

 radius ; it probably represents part of the deltoid. The 

 humero-radialis lateralis (flexor carpi ulnaris) is single. 

 The carpo-digitalis ventralis brevis is confined to the hand. 

 O.C. 63 E. 



C. 133. The nerves and deep muscles of the left fore-limb of a 

 Crocodile (Crocodilus acutus). There is no ulno-carpalis 

 (accessory pronator). The teres major is well developed. 

 O.C. 63 F. 



Fiirbringer, Morph. Jahrb., Bd. i. 1876 ; p. 767. 



C. 134. Part of the sternum, shoulder-girdle, and left wing of a 

 King Vulture (Cathartes papa), showing the muscles. The 

 pectoralis is separable into two distinct portions. The 

 larger of the two (mostly removed in the specimen) is 

 superficial in position ; it rises from the posterior part of 

 the body of the sternum, the border of the sternal keel, and 

 the clavicle, and is attached to the radial crest of the 

 humerus. The second part (which has been slightly raised 

 to show the supracoracoideus beneath it) rises from the 

 sternal keel and clavicle beneath the first, its fibres rapidly 

 converge to a narrow flat tendon which is attached to the 

 humerus distal to the first part. The pars extensor secund- 

 ariorum of the metapatagealis is well marked : this muscle, 

 situated beneath the skin of the elbow, spreads the proximal 

 secondaries ; it is remarkable for the length and delicacy 

 of its tendon of origin. The deltoid extends little more 

 than halfway down the humerus. 0. C. 64 Y h. 



C. 135. Eight wing and half the trunk of a Rook (Trypanocorax 

 frugilegm), showing the muscles. During flight the wing 

 is mainly moved as a whole from the shoulder ; its primary 

 movements are depression and elevation, constituting re- 

 spectively the essential parts of the stroke and recovery. 

 The down stroke is produced by the pectorah's major, a 

 muscle that occupies the greater part of the cavity between 

 the surface and keel of the sternum : elevation is due to a 



