PICARI^ 7 



the basi- sphenoid or upon its rostrum, which articulates with facets 

 .on the pterygoids, is a character of considerable value in the 

 diagnosis of certain groups of birds (fig. 5, p. 5). 



VJI. — Mr. Garrod laid great stress on the presence or absence 

 of five muscles in the thigh of birds ; although subsequent research 



bro. 



Fig. 7. —Base of the skull of Dromceus, showing the dromseoguathous 

 arrangement of the palate bones : vo, vomer ; lac, lacrymal ; sph.r, sphenoidal 

 rostrum; pa, palatine; pfg, pterygoid; b.sph, basi-sphenoid ; g, quadrate; 

 b.ptg.pro, basi-pterygoid process of the basi-sphenoid. 



has shown that this character is not one of primary value, yet it 

 is still a useful one. 



These muscles are the ambiens, femoro-caudal, accessory 

 femoro-caudal, semitendinosus and accessory semitendinosus. 



