AORTIC ARCHES OF BIRDS — GLENNY 553 



superficial vessel to the head. Further studies are necessary to 

 make clear the relationships of these vessels in the rheas. 



References: F. P. Evans, 1883; Garrod, 1873; Glenny, 1943d. 



Species studied 



By Glenny 



Rhea americana intermedia Rothschild 

 and Chubb 



By Evans 

 Rhea americana (Linn6) 

 By Garrod 

 Rhea americana (Linn6) 



Order CASUARIIFORMES 

 Family Casuariidae 



Carotids typically A-1, but may vary; type A coracoid artery; 

 type 1 thoracic artery; vertebrals and superficial cervicals are variable 

 in origin from the common carotid arteries. 



Garrod reported two species of Casuarius to be bicarotidinae 

 normales (A-1). In a dissection of a zoo specimen of Casuarius, 

 I found that the left dorsal carotid alone entered the hypapophysial 

 canal (B-4-s). 



It is possible that in the course of evolution of these birds some 

 specific or subspecific variation in the carotid arteries may have 

 taken place. It might be quite profitable to make an extensive 

 study of the arteries in the different species and subspecies of the 

 cassowaries and to correlate these findings with their geographical 

 distribution. 



References: Garrod, 1873; Glenny, 1942c. 



By Garrod 



Casuaritts bicarunculatus P. L. Sclater 

 Casuarius benneUi Gould 



Species studied 



By Glenny 

 Casuarius sp. (zoo specimen) 



Family Dromiceiidae 



Carotids A-1 ; no other details available. 



Species studied 



By Garrod 



Dromiceius n.-hollandiae (Latham) 



Order AFTER YGIFORMES 



Family Apterygidae 



Carotids B-4-s; coracoid artery arises from the subclavian medial 

 to the thoracic artery; no axillary artery could be observed; ligamen- 



