160 Prof. A. Macalister on the Myology of 



and Dtdel^thys virginiana it is not at all separable from the 

 infraspinatus. 



The subscapularis presents no feature of interest in the 

 Wombat ; its two series of fibres are blended very perfectly. 

 In Sarcophilus it is small, and scarcely covers two-thirds 

 of the subscapular fossa. It is large in the Giant Kangaroo, 

 proportionally still larger in Bennett's Kangaroo, and mode- 

 rate in the Phalanger, Opossum, and Bandicoot. There is no 

 subscapulo-humeral muscle in any of these marsupials sepa- 

 rate from the subscapularis proper. 



The teres major is large in the AVombat, and is attached to 

 the lower half of the axillary costa of the scapula ; some fibres 

 of the inner head of the triceps are continuous with its fibres 

 of insertion. It is also well devel(){)ed in the native " Devil," 

 nmcli smaller in the Opossum, Phalanger, Macrojnis giganteus 

 and Bennett u. 



The coraco-brachialis is extremely small and rudimentary 

 in the Wombat, consisting of a fleshy fascicle inserted imme- 

 diately below the inner tuberosity of the humerus ; it is closely 

 applied to the subscapularis and capsule of the shoidder ; and 

 its origin, which is tendinous, is at first miited to the tendon 

 of the biceps. In Sarcophilus it arises by a tendinous flat 

 band from the tip of the coracoid process, and is inserted 

 into the neck of the humerus above the latissimus dorsi ten- 

 don ; it is also closely applied to the surface of the subscapu- 

 laris. In Macropus giganteus its origin is from the anterior 

 border of the small coracoid process, in a line continuous for- 

 wards from the origin of the omo-hyoid ; its insertion is similar 

 to that above described, and is continuous with the upper 

 fibres of the triceps internus. In Macropns rujicoJUs it is 

 divided into two fascicles ; but both these represent the short 

 muscle of Mr. Wood. It is similar in its nature, but is small, 

 short, and tendinous for two-thirds of its length, in the Opos- 

 sum and Phalanger. 



The biceps in all the marsupials is a double muscle ; and 

 the division is easily seen, either in the origin or in the inser- 

 tion, in all the instances which have come under my notice. 

 In the Wombat tlie muscle has two distinct tendons of origin, 

 one coracoidal and one glenoidal; from these, two bellies descend 

 the arm, slightly fused but capable of easy separation upon 

 tearing ; the fibres of the coracoidal origin pass to be inserted 

 into the radius at its tubercle, those of the glenoidal portion 

 seek an ulnar insertion in front of the insertion of the bra- 

 chialis anticus. In Sarcophilus two tendons of origin exist, 

 united, however, by a thin membranous expansion ; but on 

 dividing this and gently pulling asunder the two main ten- 



