872 



DR. C. F. SONNTAG ON THE MYOLOGY 



also coarser than the thoi^acic ones, but they are closer together. 

 In PhasGolarctos Young (14) described six cervical and nine 

 thoracic slips, and I observed the same. But Macalister (5) 

 recorded seven costal slips. As regards Fhascolomys, Macalister 

 pointed out that the cervical and thoracic parts are separate, and 

 he described them in detail. 



Text-figure 37. 



Scapular muscles in Plialanger orientalis. 

 T.Ma : teres major. Other letters as in text-fig. 36. 



Intercostal Muscles : — The number of sets of intercostals vai^ies, 

 as the result of variations in the number of ribs, but the 

 characters of the muscles are essentially similar in all : — 



Phascolarctos : ten pairs of interspaces. 

 PhasGolo'inys : fourteen pairs of interspaces. 

 Phalangeridse ; twelve pairs of interspaces. 



