of the Koala (Pliascolarctos cincreus). 129 



Is treble the size of the posterior, gaining an additional origin 

 from the tendinous line in which the omo- and stemo-hyoid 

 muscles terminate. The tendinous inscription is verj short 

 and oblique. 



Stemo-hyoid is monogastric, and has a strong origin from 

 the back of the clavicle as well as from the second and third 

 pieces of the sternum. Sterno-thyroid is much shorter and 

 more narrow, and has likewise no inscription. Mylo-hyoid 

 has very short fibres, and extends down for a very considerable 

 distance, overlying the very long slender genio-hyoidei. A 

 transverse band of muscle, like an aberrant slip of the inylo- 

 hyoidj crossed beneath the genio-hyoidei and superficial to the 

 genio-hyo-glossi -^ this is on each side attached to the mucous 

 membrane. The styloid group of muscles formed a single 

 sheet, the hinder fibres of which passed to the pharynx, the 

 middle to the cerato-hyal under the stylo-hyoid ligament ; the 

 anterior passed to the side of the tongue. Genio-hyo-glossi^ 

 the palatine muscles, and linguales are very normal. 



The trapezius is an indivisible sheet extending from the 

 inner third of the occiput to the seventh dorsal spine ; its in- 

 sertion is into the acromion and spine of the scapula ; and, 

 partly crossing the former, some of its fibres are inserted into 

 the surface of the tendinous fibres of origin of the deltoid. 

 The latissimus dorsi arose from the fourth to the tenth 

 dorsal spines, and, by the lumbar fascia, from the four spines 

 below these ; it had no costal origin. 



The trachelo-acromial [omo-ailantic) occupied by its insertion 

 one half the length of the spine of the scapula, and was much 

 thicker than usual. The rhomboid muscle is single and large, 

 half the size of the trapezius ; it occupies one half the occipital 

 curved line, the middle line of the nucha, and the three 

 upper dorsal spines. Serratus magnus Avas a single muscle 

 consisting of thirteen slips, six cervical and seven costal, whose 

 insertion was indivisible ; serratus jwsticus siqjerior extends 

 in its insertion from the second to the eighth rib : serrafus in- 

 ferior, quite continuous with it, only distinguishable by the 

 upward direction of its fibres, was attached to the ninth, tenth, 

 and eleventh ribs. Sj)lenius arose from the three upper dorsal 

 and five loAver cervical spines, and was attached to the occiput 

 and three u])per cervical transverse processes. Trachelo-mastoid 

 is not digastric, and stretches from the five lower cervical 

 transverse processes to the occipital bone. The other spinal 

 muscles were invariable. 



TlxQ great jjectoraliii large, having the usual attachments; be- 

 neath it there are the following tlirec muscles : — j)ectoralis7)iinor, 

 from the cartilages of the third and fourth ribs to the shoulder- 



