!>8 MESSRS. WATSON AND YOUNG ON THE [Jan. 14, 



The coraco-brachialis is a c. brevis (Wood). It springs from the 

 upper border of glenoid cavity, and passes to the shaft of the humerus 

 just above the insertion of the latissimus. Such, according to Wood', 

 is also the arrangement in the Dog and Cat ; and so have we 

 found it in the Civet. In other of the ('arnivora, e. g. Bears, the 

 coraco-brachialis exists as a double muscle, corresponding to the long 

 and short varieties of Wood. 



The triceps possesses four distinct heads. Of these the scapular, 

 very large, springs from nearly the whole length of the axillary costa 

 of scapula. The second and "third arise from the upper third of the 

 humeral shaft, and are separated by the origin of brachialis anticvs. 

 The fourth head is a small muscular bundle from the olecranon-fossa 

 and adjoining part of the shaft of humerus. These heads have a 

 common insertion into the olecranon process of ulna. 



In the Civet the muscle is similarly constituted ; the long head, 

 however, is more limited at its scapular attachment. 



Supinato)- longus is absent ; a tendinous vestige exists and appa- 

 rently represents it. According to Meckel it is also wanting in H. 

 striata j whilst Douglas records its absence in the Dog. In the Civet, 

 however, it exists, comparatively small and feeble, but quite distinct. 



The extensores carpi radiates longior et brevior arise conjointly 

 from the outer condyloid ridge of humerus. Fused for some distance 

 the two muscles are inseparable ; the respective fibres, however, ter- 

 minate on two separate tendons, which are inserted into the metacar- 

 pals of index and middle digits. The muscular fibres at the origin 

 are similarly interblended in the Civet and Dog, whilst in H. striata 

 Meckel describes the muscles as distinct throughout, the tendons 

 being united by a transverse band. 



Extensor communis digitorum, from the outer condyle and inter- 

 muscular fascia, terminates in the usual manner, passing to the four 

 outer toes. 



There is an extensor carpi ulnaris, from the external condyle to 

 the base of metacarpal of little digit. 



A small supinator brevis passes from the orbicular and external 

 lateral ligaments to the radius anteriorly, reaching just belowtheelbow. 



A double extensor minimi digiti springs from the outer humeral 

 condyle ; its tendons pass to the two outermost digits {annularis and 

 minimus). The same obtains in H. striata. In the Civet the 

 muscle terminates by three tendons, which are distributed to the 

 three outer toes ; whilst, according to Douglas, in the Dog there is 

 but a single tendon of insertion, this being confined to the fourth 

 digit {annularis). 



The extensor primi internodii is wanting or is quite inseparable 

 from the extensor ossis metacarpi pollicis. The latter arises from 

 the whole length of internal surface of ulna and adjoining interosseous 

 membrane, and also slightly from the upper end of the radius. 

 It is inserted into the base of rudimentary poUex. Such also is the 

 arrangement in the Dog, Civet, and H. striata. 



An extensor indicis passes from the middle of the external border 



' Wood, " on Muscular Variations," Journal Anat. and Phys. vol. i. p. 55. 



