FIG. 34. Oblique left lateral view of the second layer of muscles of the upper 

 extremity, being those of the dorsum and arm, of a Raven. The 

 heads of the ribs have been disarticulated from the vertebrae, and the 

 latter drawn up with a dissecting hook and chain, the better to show 

 the trapezius and rhmnboideua muscles. The os Immero-scapulare has 

 been entirely freed of both the deltoid and ligamentous attachment, 

 though left in exactly its normal position in this bird. Life-size, by the 

 author, from his own dissections. 



