240 MR. F. E. BEDDAUD ON [Apr. 7, 



insertion is on to humerus by tendon in common with the teres 

 major ; it gives oflF, as is so usually the case in this group of animals, 

 a dorso-epitrochlear slip which runs to elbow. 



The Teres major arises from about the upper half of the posterior 

 margin of the scapula ; it is inserted, as already mentioned, in common 

 ■nith the latissimus dorsi by a flat tendon about half an inch long 

 and rather more than half an inch broad at its insertion. 



The Deltoid consists of two more or less distinct portions — one 

 arising from the spine of the scapula and apparently also from the 

 fascia covering the infraspinatus ; the smaller part of the muscle 

 springs from the acromion and metacroniion ; the two are inserted in 

 common on to the deltoid ridge by an insertion which is fleshy above 

 but tendinous below. 



The Pectoralis primus is much blended with the panniculus carnosus ; 

 its insertion is shown in the accompanying drawing (woodcut, fig. 3) 

 to extend a long way down the humerus. 



The Triceps consists of four distinct parts, or of five if the dorso- 

 epitrochlear be reckoned as belonging to the Triceps. The first 

 part arises from scapula and also from the fascia covering the infra- 

 spinatus ; the second part is blended at its origin with the insertion 

 of the infraspinatus ; it arises from the neck of tbe humerus and from 

 the deltoid ridge. The third part is smaller ; its origin is tendinous 

 from the neck of the humerus just below the insertion of the teres 

 majur and latissimus dorsi. The fourth part is entirely fleshy and 

 arises from the greater part of the shaft of the humerus. 



The Coraco-brachialis arises from the coracoid by a strong flat 

 tendon ; its insertion is also tendinous for the greater part and 

 extends for some way down the humerus, beginning with the head ; 

 the posterior part of its insertion is fleshy. 



The Biceps has only a single origin and a single insertion on to 

 the ulna. 



The biceps is also inserted in common with a peculiar muscle 

 shown in the accompanying drawing (woodcut, fig. 3, x) ; this muscle 

 arises by two fleshy heads from the humerus, one on either side of 

 the insertion of the pectoralis. 



The Brachialis aniicus curves round the arm as it does in other 

 Rodents ; it has a tendinous iusertion on to the ulna beyond that 

 of the biceps. 



The Pronator radii teres is not a very strong muscle ; it arises from 

 the outer condyle of the humerus and is inserted on to the radius. 



The Flexor metacarpi radialis is the next muscle to the pronator 

 radii teres ; it is attached by a long tendon to the second metacarpal 

 (= 3rd digit) near to the proximal end. 



The Flexor carpi ulnaris is attached in the usual way by a very 

 stout tendon. 



The Flexor sublimis arises in common with the flexor profundus ; 

 it divides into three delicate tendons which supply digits 2, 3, and 4. 



The Flexor profundus and Flexor pollicis lonffus are difficult to 

 distinguish ; the common tendon arises from the fusion of four 

 more or less distinct muscular heads. Two of these arise from the 



