95 



perior part of the human trapezius, which is inserted in the 

 clavicle. 



5. M. Stemomastoideus. 



The sternal portion of the mastoid muscle is represented in the Seal 

 by two distinct muscles — 



(a) — The first having its origin inside the top of the sternum, and 

 its insertion, by a fine tendon, into the mastoid portion of the 

 temporal bone, 1 oz. 



(b) — The second having its origin from the whole length of the 

 first rib ; and its insertion into the under part of the lower jaw, 

 near the symphysis. 



6. M. Omo-atlanticus, 1^ oz. 



Origin ; from transverse process of the atlas. 



Insertion ; into the top of the pectoral ridge of the humerus, on the 

 outer side. 



This is the muscle which I have described in Note 2, as occurring 

 in Cercopithecus and Macacus, under the name of trachelo- 

 acromius, of Cuvier. In the Seal, its insertion is shifted from 

 the spine of the scapula to the humerus, where it assists the 

 general swimming or rotatory action of the limb. 



7. M. levator anguli anterior is scapulce, f oz. 



Origin ; from the transverse process of the atlas. 

 Insertion; into the vertebral edge of the scapula, at the end of the 

 scapular ridge. 



This is the levator anguli scapulce of anthropotomists, with origin 

 and insertion somewhat shifted ; it is really a portion of the M. 

 serratus magnus. 



8. M. serratus magnus, not recorded. 



Origin ; from the transverse processes of the cervical vertebrae 



from the 2nd to the 7th. 

 Insertion ; into the vertebral edge of the scapula, behind its spine. 



9. M. levator anguli posterioris scapulce, \\ oz. 



Origin ; central portion of occipital ridge. 



Insertion ; posterior exterior angle of vertebral edge of scapula ; 



marked d, Tig. 17. 

 The mechanical action of both levators is similar. 



10.* If. latissimus dor si proprius, 3 J oz. 



The true latissimus dorsi underlies the superficial, already noticed, 

 and consists of two parts, quite distinct, viz. — 



(1) Humero-dorsalis, f oz. 



(2) Scapulo-costalis, 3 oz. 



The first of these muscles (1), or humero-dorsalis, represents the 

 latissimus dorsi of anthropotomists ; its origin is from the spinous pro- 

 cesses of the posterior dorsal vertebras and from their ribs ; and its inser- 

 tion is by means of a tendon common to it and the M. teres inferior into 

 the inner side of the upper part of the humerus, at the line marked (b) 

 in Fig. 16, 



