156 Prof. A. Macalister on the Myology of 



The complexus is very large in the Wombat, and is attached 

 to the transverse processes of all the cervical vertebraj and the 

 upper five dorsal vertebra ; its insertion is into the occipital 

 bone, as usual, on each side of the mesial line. In Sarco- 

 phihis it is very large, and is intersected by several inscrip- 

 tions. In the Macropus gi'ganteus, the Phalanger, and Opos- 

 sum, as well as in the "Wallaby, it is similar in arrangement. 



The semispinalis colli, the ilio-costalis dorsalis, and colli, 

 the recti capitis postici major and minor, the obliqui capitis, 

 are all normal in all, the first three merely varying slightly in 

 the number of their vertebral attachments. The intercostals, 

 the levatorcs costarum, interspinales, intertransversales, lon- 

 gissimus dorsi, and trachelo-mastoid are all normal, and in 

 none of the marsupials presented any features of interest. 



Tlie latissimus dorsi of the Wombat arises from the lower 

 six ribs, from the spinous processes of the lower eleven dorsal 

 vertebra, and from the lumbar aponeurosis. It has no con- 

 nexion with the angle of the scapula, and is inserted in front 

 of the teres major, and slightly connected with it, into the 

 usual situation on the humerus. This muscle sends off the 

 dorsi epitrochlear muscle, or omo-anconeus of Prof. Owen, 

 which, arising directly from the tendon of the latissimus dorsi, 

 is inserted into the inner side of the olecranon process. In 

 Perameles, Professor Owen describes this muscle as having an 

 accessory origin from the inferior angle of the scapula. In 

 Sarcophilus its attachments are the same, and the dorsi epi- 

 trochlear muscle is as in the Wombat. In the Opossum it 

 arises from the seventh to the thirteenth dorsal vertebra, and 

 from the lumbar vertebrae, by a fascia, and, as remarked by 

 Meckel, from none of the ribs ; it is inserted into the usual 

 ridge on the humerus. In the Phalanger the muscle similarly 

 detaches a dorsi epitrochlear muscle ; and the parts are similar 

 in the Wallaby and the Giant Kangaroo. 



The pectoralis major in the Wombat arises from the sternum, 

 from the sternal half of the clavicle, and from the upper six ribs, 

 and is inserted into the pectoral ridge of the humerus ; a sepa- 

 rate portion exists underneath, which extends from the manu- 

 brium sterni and from the cartilage of the first rib to the head 

 of the humerus, on a level above the last : these two portions 

 are quite separate from each other ; but I think they are only 

 separate factors of the great pectoral. A similar band I found 

 in the Badger, in which a fasciculus beneath the great pectoral 

 passed from the top of the sternum to the greater tuberosity 

 of the humerus : this seems to correspond to the third portion of 

 the great pectoral in the Hare, Rabbit, Guinea-pig, and Agouti. 

 In Sarcoj)hiIus the muscle passes from the clavicle, sternimi. 



