514 



STRUCTURE AND CLASSIFICATION OF BIRDS 



nasal is only represented in the specimen before me by a 

 minute pointed bit of bone attached above to a point cor- 

 responding to that whence the ' naso-maxillary ' arises in 

 Rhea. 



Dromceus has twenty cervical vertebra. The atlas is 



FIG. 244. SKULL OF EMU (AFTER HUXLEY). 



Pmx, premaxilla ; Mxp, maxillo-palatine ; T", vonier ; PI, palatine ; I't, pterygoid : 



*, basipterygoid process. 



notched, very nearly perforated (fig. 66, p. 118). Thejprocora- 

 coid is not quite so well developed as in Rkea, but there 

 are a pair of rudimentary clavicles. 



The sternum (fig. 74, p. 129) ' much resembles that of 

 Rhea ; ' it is not notched and is rather pointed at its 

 extremity. Three or four ribs reach it. 



