1881.] OF CERCOPITHKCUS CALLITRICHUS. 813 



continuous with the postero-internal margin of the anterior belly of 

 the muscle '. 



Sterno-mastoid united above with cleido-mastoid ; cleido-occipital 

 inserted close to, but not united with, trapezius ; omo-hyoid small, 

 without tendinous intersection. 



Trapezius inserted into the whole length of the spine of the scapula, 

 also into the outer extremity of the clavicle. Pectoralis major arises 

 from almost the whole length of the clavicle and from the sternum 

 as far as the xiphoid cartilage. Pectoralis minor consists of two 

 separate parts : the anterior, from the cartilages of the third to the 

 sixth rib, is inserted into the capsular ligament of the shoulder- 

 joint ; the posterior, from the aponeurosis of the external oblique, is 

 inserted by an aponeurosis into the outer margin of the bicipital 

 groove, being connected with the insertion of the anterior part into 

 the capsular ligament. These divisions do not touch each other, 

 but pass separately and parallel to their insertions. 



Levator claviculce double, from the atlas, forms two large muscles 

 which are inserted, one behind the other, under cover of the frajie- 

 zius, into the acromion and anterior third of the spine of the scapula ; 

 from the inferior margin of the anterior muscle a small slip of mus- 

 cular fibres is detached and inserted into the outer extremity of the 

 clavicle. 



Levator an(/uli scapulcB and serratus magnus are so intimately 

 connected at their insertions, that it is difficult to say where the 

 origin of one begins or the other ends. The former appears to be 

 represented by two perfectly separate muscles, of which one arises 

 from the transverse process of the atlas, and is inserted into the 

 posterior border of the scapula near its angle ; the other, from the 

 axis, is inserted immediately in front of the preceding ; then follow 

 two other muscular slips arising respectively from the third and 

 fifth cervical vertebrae, which are continuous at their insertions with 

 the serratus magnus. 



The three scaleni are well developed : the posterior is very large, 

 and inserted by two divisions as far backwards as the fifth rib ; the 

 inferior division passing under cover of the external oblio,ue to its 

 insertion, the superior is inserted into, and becomes directly con- 

 tinuous with the fibres of that muscle, which may thus be said to 

 extend from the neck to the pelvis. 



Rectus abdominis et sternalis is very broad ; its fibres end abruptly 

 anteriorly along an oblique line extending from the sternum behind 

 the articulation of the fifth rib to the commencement of the osseous 

 part of the third rib, where it is inserted into a fibrous aponeurosis, 

 attached internally to the sternum and anteriorly to the first rib. 

 From the outer margin of this aponeurosis (which equals the rectus 

 in width, and looks like its continuation forwards, but its fibres are 

 directed obliquely forwards and outwards) a thin flat muscle, the 

 sterno-costalis, arises. 



The deltoid is well developed ; its ini'erior margin is connected 



' See my paper, " On the Tendinous Intersection of the Digastric," Proo Eoy. 

 Soc. 3lBt March 1881. 



