121 



rior is large, thick and strong," If I am not mistaken, 

 the Superior and Inferior Obliquus are not normal, and 

 the Superior Oblique, , I should not designate as large, 

 thick and strong. 



MUSCLES OF THE NECK. 

 M. Sterno-Mastoideus. 



The Sterno-mastoideus is a long muscle of uniform size, 

 nowhere. of any great width. It arises, with its 'fellow, 

 on the midline of the outer surface of the manubrium. It 

 is inserted by a flat tendon, into the side of the skull, 

 in what may correspond to a mastoidal region. Its 

 length is about four inches, and its width about one half 

 an inch. 



Owen says that in the Ornithorhynchus it is a double 

 muscle on both sides, one portion being superficial to an- 

 other, deeper seated part. 



Each portion arises separately from the episterum and 

 is separately inserted into the mastoic region. 



In Tachyglossa I find no such condition nor does Mi- 

 vart make mention of it in the specimen which he dissected. 



M. Sterno-hyoideus. 



I think that the M. Sterno-hyoideus and M. Sterno- 

 thyi-oideus may have been confounded by Mivart with the 

 M. Sterno-glossus, which is one of the most marked mus- 

 cles of the neck, and intimately connected with these two. 

 Such a mistake would be a very natural one, if the inser- 

 tions were destroyed, as they must have been in the spec- 

 imen, which he dissected. He says the Sterno-hyoid is 

 continued up, under the larynx, and appears to be contin- 

 ued on, into the Hypoglossus as in Oruithorhyuchus. I 



