430 Bulletin of the British 



sented in both the Polar Extremities, but the species were in 

 every case different. The Order Tubinares was essentially 

 Antarctic, at least ten species having been met with in 

 Antarctica, whereas in the Arctic regions Fulmarus glacialis 

 was the sole representative of the group. On the other hand, 

 when we came to the Pygopodes, which were essentially an 

 Arctic group, three species were amongst the more abundant 

 of birds in the Arctic regions, and a fourth had occasionally 

 been met with, but not a single form of this group was found 

 in Antarctica. Descending to the Impennes, at the bottom 

 of the list, we came again to an essentially Antarctic group, 

 which was absolutely unknown in the Arctic regions, but was 

 well represented by multitudinous individuals of at least 

 four species in Antarctica. 



The facts, therefore, as regards Arctic and Antarctic birds 

 might be shortly summarized by stating that no two Avi- 

 faunas could be more essentially different, not a single species 

 being identical, and only three genera out of seventeen, 

 whilst the Pygopodes of the North were replaced by the 

 absolutely different Order Impennes in the South. 



Birds of Arctica. Birds of Antarctica. 



I. Passeees. 



1 . Plectrophenax nivalis. 



2. Calcarius lapponicus. Corvus, sp. inc. (?). 



3. Otocorys alpestris. 



4. Nyctea scandiaca 



II. Striges. 



III. ACCIPITRES. 



5. Falco candicans (?). 



IV. Anseres. 



6. Bernicla bi-enta. Chloephaga, sp. inc. (?). 



7. Somateria mollissima. 



V. LlMICOL^. 



8. Tringa fuscicollis. 1. Chionis alba. 



9. striata. 



10. Calidris arenaria. 



