AORTIC ARCHES OF BIRDS — GLENNY 



575 



Family Chionididae 



Ligamentum botalli prominent; vertebrals and superficial cervicals 

 separate in origin from the common carotid artery; left common caro- 

 tid gives off an accessory oesophageal artery. 



Species studied 



By Glenny 



Chionis minor minor Hartlaub (2) 



FamUy Stercorariidae 

 Carotids A-1 ; no additional information available. 



Species studied 



By Garrod 



Lestris antarciicus= Catharacia skua antarciica (Lesson) 



Family Laridae 



Ligamentum botalli usually absent, but may be present at least in 

 part; vertebrals and superficial cervicals usually have a common 

 root, but this is variable; the left common carotid usually sends off 

 an accessory oesophageal artery. The number and origin of the 

 cervical arteries vary somewhat within the family. 



Species studied 



By Garrod 



Larus argentatus Pontoppidan 



Larus glaucus= Larus hyperboreus Gun- 



nerus 

 Sterna hirundo Linn6 



By Glenny 



Larus heermanni Cassin 

 Larus argentatus Pontoppidan 

 Larus hyperboreus Gunnerus 

 Larus Philadelphia (Ord) 



Rissa tridactyla tridadyla (Linn6) 



Rissa tridactyla pollicaris Ridgway 



Xema sabini (J. Sabine) 



Sterna hirundo Linne 



Sterna paradisaea Pontoppidan 



Sterna vittata Gmelin 



Sterna forsteri Nuttall 



Sterna albifrons antillarum (Lesson) 



Thalasseus bergii (Lichtenstein) 



Anoiis stolidus pileatus (Scopoli) 



Anoiis minutus melanogenys G. R. Gray 



Gygis alba Candida (Gmelin) 



Family Rynchopidae 



Ligamentum botalli greatly reduced or lacking; vertebrals and 

 superficial cervicals have a common root from the common carotid; 

 the left common carotid sends off an accessory oesophageal artery. 



Species studied 



By Glenny 

 Rynchops nigra nigra Linne (2) 



