Birds of Heligoland. 29 



354. Larus leucopterus. 

 One or two in most winters. 



355. Larus marinus. 



Common from late autumn to early spring. 



356. Larus fuscus. 



Rare; principally met with in autumn. 



357. Larus affinis. 



One shot in August 1878, and a second in Octoher 1888. 



358. Larus argentatus. 



The commonest Gull on the island ; used to breed on 

 Sandy Island eighty years ago. 



359. Larus canus. 

 Common. 



360. Larus tridactylus. 

 Very common in winter. 



361. Larus ichthyaetus. 

 One shot many years ago. 



362. Larus ridibundus. 



In small numbers, principally in autumn. 



363. Larus bonapartu. 



One shot in the winter o£ 1815. 



364. Larus minutus. 

 Common in autumn. 



365. Larus sabinii. 



One shot in October 1847, another in October 1883. 



366. Larus rossi. 



One shot in February 1858. 



367. Larus eburneus. 



One or two believed to have been seen. 



368. Sterna cantiaca. 



Very common in spring from the last half of April and in 

 autumn. 



369. Sterna dougalli. 



Two shot during the last lialf-centurv. 



