470 MR. A. H. GARROD ON THE [May G, 



PROCELLARIIDiE. 



Both carotids are present in all these hirds. 



Species examined. 



Thalassidroma pelagica. JEstrelata lessoni. 



fregata. Prion vittata. 



bidweri. 



PYGOPODES. 



Both carotids are present in the following species : — 



COLYMBID^. ALCID.E. 



Colymbus glacialis. Alca torda. 



Uria troile. 



The left carotid only is present in the following species : — 



Colymbid^e. Alcid^e. 



Podiceps cristatus. Arctica alle. 



— — minor. 



IMPENNES. 



Both carotids are present in these birds. 



Species examined. 



Spheniscus demersus. Aptenodytes pennantii. 



humboldtii. 



CRYPTURI. 



Both carotids are present in these birds. 



Species examined. 



Rhynchotus rvfescens. Crypturus sallcei. 



STRUTHIONES. 



Both carotids are present in 

 Struthio camelus. 



The left carotid alone is present in 

 Rhea americana. 



Both carotids are present in 



Casuarius bennettii. Dromceus novae-hollandiae. 

 bicarunculatus. 



The left carotid only is present * in 

 Apteryx mantelli. Apteryx owenii. 



* In his ' Anatomy of Vertebrates ' (vol. ii. p. 199), Prof. Owen remarks : — 

 " In the Apteryx I found that the left carotid alone passed to the usual place in 

 the neck, and divided at the third cervical vertebra, to supply the head in the 

 usual way." But in the original memoir on the bird (Trans. Zool. Soc. vol. ii. 

 p. 273) the same author has stated that both are present, which is not the case 

 in the specimens examined by me. 



