TUHINAKKS-l'KOrKLI.AiniDi: 239 



Sula bassana bassana (L.). G an net. /v-. Fou de 

 Babban ; Ger. Dabs Folpcl ; /A//. Sula ; S^ved. Hafsula. 



^^ While; crown and najje buff; primaries black; on 

 top of toes a row of plaleb, continued uj) tarsus in three rows 

 with reticulations between. Iris yellowish white. Naked skin 

 round eye, eyelid, and centre of chin pale blue. Bill livid blue 

 with dark slate lines. Legs and feet greyish black, back of 

 toes and front of tarsus greenish. Wing 465-500. Tarsus 55-57. 

 Bill 90-97. Young : first year, above dark brown with white 

 spots ; beneath buff mottled greyish brown ; the while plumage 

 is gradually assumed and complete adult dress attained in 

 fourth year. 



Breeds. — Scottish Coasts (several colonies), Ireland (one 

 colony), Wales (one colony), Faroes, Iceland, and in America 

 in Gulf of St Lawrence and off S. Newfoundland. In winter 

 ranges south to Canary Islands, Azores, Madeira, and W. Coast 

 of Africa, occasional in Mediterranean, rare in Baltic Sea ; on 

 American Coast south to Gulf of Mexico. 



TUBINARES. 



Oceanic birds with a superficial resemblance to 

 Gulls ; feet webbed ; nostrils external and tubular ; 

 bill hooked ; rarely go ashore except to breed ; nest 

 in burrows, crevices of cliffs, or under stones or rocks ; 

 sini^le egg, white, sometimes with faint reddish spots in 

 a zone near large end ; young hatched blind and covered 

 with down ; food, small crustaceans, fishes, etc. 



PROCELLARIIDJE. 



Nostrils united above culmcn ; 2nd primary longest. 



Thalassidroma. 



Small; plumage black with while at i)asc of tail; iiarcs 

 in a single tube and separated by membrane; tarsus slightly 

 longer than middle toe and claw; ist phalanx of middle 

 toe shorter than the two others combined. 



