MYOLOGY OF THE ORNITHORHYNCHUS. 131 



Scalenus. There is but one a small insignificant slip proceeding 

 to the first rib, to be inserted opposite the origin of the first digita- 

 tion of the serratus magnus. It lies on the extreme side of the 

 neck, just in front of the cervico-scapular muscle, and appears to 

 begin there, with attachment at the middle of the neck; but it is really 

 continuous by a slight tendinous intersection, with a portion that runs 

 higher up, with attachments all along to its real origin, definite, at 

 the apex of the spur of the hypapophysis of the atlas. 



Longus colli. An upper portion is not demonstrably distinct from 

 the lower; its place is apparently taken by the unusually large muscle 

 next succeeding. The muscle lies upon the bodies of the vertebrae, 

 with attachments by slips as usual to 5-G processes, from first dorsal 

 upward ; below, it terminates inside the chest. 



Rectus capitis anticus major. Large; arising both tendinous and 

 slightly fleshy from the basioccipital just in front of the articulation, 

 passing down over the hypapophysis of the atlas without attachment 

 thereto, in apposition with its fellow; forming a distinct fleshy fusi- 

 form belly, traversing the whole length of the neck in front, with at- 

 tachments by slips to the anterior aspect of transverse processes, 

 more or less blended with the similar digitations of the longus colli. 



H. c. a. minor?, or lateralis? (possibly neither, as it has no origin 

 from the atlas). A rather large muscle, arising fleshy from the whole 

 length of the transverse process of the axis, passing upward across 

 the atlas, between its transverse process and its hypapophysial spur, 

 narrowing as it ascends, to the head (insertion destroyed in the 

 specimen). Just back of this muscle, and appearing like a prolonga- 

 tion of it, interrupted by the transverse process of the atlas, a little 

 muscular plane runs from the process just named to the roots of the 

 spinous processes of 3d-4th cervical vertebra?. This is entirely dis- 

 tinct from the series of cervical intertransversales. 



(b'. Posterior vertebral and not upward prolongation of dorsal 

 muscles.) 



The two recti capitis postici, if these occur, were completely de- 

 stroyed. 



Obliquus inferior. Of great size, as in some marsupials that, like 

 Didelphys, have greatly developed cervical spinous processes; and 

 resembling a second complexus, but of course without cranial attach- 

 ment. A bulging fleshy mass, arising muscular from the sides of the 

 spinous processes of axis and next 3 vertebrae, by 4 digitations ; 

 passing obliquely upward and outward to be inserted fleshy into 

 the whole upper surface of the transverse process of the atlas. 

 A powerful rotator of the head, as in the action of shaking it 

 sideways. 



0. superior. A small terete muscle, arising fleshy from the poste- 



