130 PHYSIOLOGICAL SERIES. 



the specimen most of the inner one has been removed), 

 originating from the sides of the deep flexor tendon and 

 inserted into the fetlock. The interossei of the splint- 

 bones are rudimentary and lie between them and the 

 metacarpal, while the short flexor of in. dig. has been 

 transformed into the great posterior suspensory ligament 

 of the fetlock. 0. C. 284 M. 



C. 153. Right fore-limb of a Calf (Bos taurus), showing the 

 superficial muscles. The reduction in number of the digits 

 and the acute angles at which the several bones meet indi- 

 cate that the limb is suitable for rapid movement. The 

 muscles, with the exception of the extensor antebrachii, are 

 of slender build, but occasionally (e.g. teres major, brachialis 

 internus) gain considerable extra power by their insertion 

 at a distance from the joint. As in the bird's wing (C. 135) 

 the limb is rendered light and mobile by the concentration 

 of the weight towards the proximal end, the distal tendons 

 being of great length. Increased rigidity of the elbow-joint 

 is gained by the loss of all movements of pronation and 

 supi nation : in consequence, pronators and supinators are 

 absent. The following details are of special interest : 

 The biceps is represented by the long head only, the tendon 

 of origin lies outside the capsule of the shoulder-joint, its 

 insertion is upon the radius. The extensor digitorum com- 

 niunis is double ; the tendon of the inner head is attached 

 to in. dig., that of the outer to in. dig. and iv. dig. 

 The extensor carpi ulnaris is fused at its insertion with 

 the flexor carpi ulnaris. In front of the flexor carpi 

 radialis there is a fibrous band, which probably represents 

 the pronator teres. 0. C. 64 x e. 



Presented l>y Colonel Burgess. 



C. 154, Left fore-limb of a Calf (Bos taurus), showing the deep 

 muscles. On the extensor surface a small slip is shown 

 which, rising from the ulna, passes over the extensor pollicis 

 and unites with the extensor communis. The flexor pro- 

 fundus rises by three very distinct heads from the humerus, 

 olecranon, and radius respectively. There are no lumbricals. 

 0. C. 64 X/. Presented l>y Colonel Burgess. 



