564 



PROCEEDINGS OF THE NATIONAL MUSEUM 



podidae; vertebrals and superficial cervicals usually have a common 

 root from the common carotid arteiy. 



References: Bakst and Chafee, 1928; Balfour, 1873; Barkow, 1843; 

 Beddard, 1898; Bremer, 1928; Buell, 1922; H. Evans, 1909a, 1909b; 

 Fleming, 1926; Garrod, 1873; Glenny, 1951a; H. Hahn, 1909; Hughes, 

 1934; Kashchenko, 1887; I&assnig, 1913a; Liilie, 1908, 1919; Locy, 

 1906; Mackay, 1887; Mail, 1887; Patten, 1929; Pohlman, 1920; 

 Quirmg, 1933; C. G. Sabin, 1905; F. R. Sabin, 1917; Squier, 1916; 

 Tonge, 1869; Tvaning, 1906; Vialleton, 1892. 



FamUy Megapodiidae 



Unicarotid (see list of species below) ; coracoid artery usually type 

 A, but if more than one pair is present one may be opposite or lateral 

 to the axillary artery (type D); type 1 thoracic artery; ligamentum 

 botalli greatly reduced or absent. 



Figure 114. — Main cervical and thoracic arteries in Megapodius freycinet layardi, ventral 

 view. (For explanation of symbols see p. 551.) 



In a single specimen of Megapodius layardi (AMNH specimen), 

 the right systemic arch was absent, the ductus caroticus serving to 

 carry the blood from the carotid arch to the right radix aortae 

 (fig. 114). While this is the first such instance to be reported, it may 

 well be found to occur in other species. 



