548 MR. J. BESWICK-PERRIN ON THE [June 20, 



The levator claviculae is a long, slender, and entirely muscular 

 slip, which arises from the bottom of the digastric groove, external 

 to the digastric muscle. It passes almost directly backwards towards 

 the shoulder, to be inserted into the rudimentary clavicle, behind the 

 levator humeri, with which it is closely associated. In the Para- 

 doxurus it has the same arrangement, except that it is situated at its 

 origin a little internal and posterior to the digastric muscle. The 

 clavicle in this animal is represented simply by a tendinous intersec- 

 tion in the levator humeri. 



In the Dog it is described by Douglas as the musculus ad levatorem 

 accessorius. 



The levator scapula arises from the anterior aspect of the broad, 

 expanded, and wing-like transverse process of the atlas. It is in- 

 serted into the spine of the scapula near its anterior extremity. In 

 the Paradoxurus the atloid attachment is not so decidedly in front of 

 the transverse process, being more to its lower and outer border. 

 At its insertion it is continuous with the anterior scapular fibres of 

 insertion of the trapezius muscle. This muscle is the levator scapulae 

 major vel anterior of Douglas*. 



The levator scapulae minor is a detached segment of the levator 

 anguli scapulae. It arises from the lower border of the transverse 

 process of the atlas, and is inserted into the dorsal extremity of the 

 spine of the scapula. This muscle is wanting in the Paradoxurus. 

 The slip which corresponds to it is blended with the levator anguli 

 scapulae. It presents the latter arrangement in the Dog. 



The occipito-scapular occupies the rhomboid plane, and is very 

 closely connected with the anterior border of the rhomboid muscle 

 during its whole length. There is certainly a slight indication of an 

 areolar interval ; but the separation of this muscle from the rhomboid 

 is arbitrary. In the Paradoxurus there is not the slightest trace of 

 an areolar interval between the two. In the Kinkajou it arises from 

 the occipital ridge external to the protuberauce. The rhomboid is a 

 continuation from the posterior border of this muscle downwards as 

 far as the fourth dorsal spine. The occipito-scapular is inserted into 

 the superior angle of the scapula, close to the base of the spine, and 

 slightly in advance of the rhomboid muscle. The rhomboid extends 

 from the preceding to the posterior inferior angle of the scapula. 

 In the Paradoxurus the rhomboid does not extend along the neck 

 beyond a point corresponding to the middle of its entire length. 



The omo-hyoid arises from the superior angle of the scapula, lying 

 between the supraspinatus and the subscapularis. It is inserted 

 into the hyoid bone. In the Paradoxurus and Dog it is wanting. 



The levator humeri proprius arises fleshy from the masto-occi- 

 pital ridge and the posterior cervical raphe as low down as the second 

 cervical vertebra. The origin of this muscle is inseparably connected 

 with the trapezius at its lower part. It is inserted into the delto- 

 pectoral tubercle, where it blends with the lower fibres of insertion of 

 the anterior pectoral muscle. The trapezius presents a remarkable 

 arrangement, the muscles of the two sides being directly continuous 

 * Myographia Comparata. 



