iv.] SKELETON OF UPPER LIMB. 159 



clavata. They may form one osseous whole in Birds (e.g. 

 the StruthionidcE or Ratita>}, continuing on in one main 

 direction. They may, on the contrary, as in all carinate, or 

 ordinary Birds, be so placed that the coracoid forms with the 

 scapula an acute angle open backwards. 



To the parts which represent the scapula and coracoid in 

 osseous Fishes, the names of ulna and radius have sometimes 

 been respectively applied. The coracoid may attain a pro- 

 digious size, as e.g. in the Opah fish (Lampris). 



FIG. 134. BONES OF THE RIGHT ARM AND SHOULDER OF THE SMALL 

 TANREC Hemicentetes. 



This view shows the elongated scapula with blunt metacrowion and very small 

 coracoid; also the largely-developed clavicle attached to the end of the 

 acromion and projecting freely the humerus with the prominent deltoid 

 ridge (or crest) and the radius applied closely in front of the ulna, which 

 latter bone has a well-developed ilecranon. 



12. The apparent simplicity of the CLAVICLE in man would 

 hardly allow of a correct d priori conjecture as to the 



