Mr Harvie-Broiviis Fitrtlicr Notes on North Bona. 297 



have already given {supra). It appeared difficult to estimate 

 their numbers, but we are surely below the mark if we put 

 them down at from 60 to 80 or even 100 pairs at the old 

 liouses, and it is possible more may be found on other parts 

 of tlie island. 



Procellaria pclagica (Linn.) — Storm Petrel. — While Swin- 

 burne did not meet with any of this species, and we only 

 obtained two sheltering among the corridors of the Fork-tailed 

 petrels' colony, Barrington found a large colony on the western 

 end, where there were none of P. leiicorrJioa, and also found 

 one or two P. i^dagica in the colony of P. leucorrhoa on the 

 south-east side. " The churr of the stormies at nights," adds 

 Mr Barrington, " was very loud, hundreds churring under 

 stones at the same time." 



Alca tor da, Linn. — Eazorbill. — Found plentifully by all of 

 us, and on Sulisgeir by Swinburne. We found " a very fair 

 colony of the two species (Guillemot and Razorbill)," the 

 Eazorbill the more abundant of the two, 



Lomvia troile (Linn.) — Common Guillemot. — Common. 

 The ringed variety was found by Swinburne, and eggs taken 

 from below the birds ; Barrington estimates their numbers 

 at 17 of the latter to 64 of the former counted. We did not 

 have time to look into this matter. 



Uria troile (Linn.) — Black Guillemot. — Swinburne found 

 a good many about the west end of Bona, and Barrington 

 found them breeding in the walls of the old dwellings a 

 hundred yards from the sea. " During the day," says Mr 

 Barrington, " they sat sunning themselves on the grassy 

 roofs of old houses. Never found this species breeding before 

 except in clefts of rocks and cliffs not high from high-water 

 mark." We saw nothing of this species in 1885. 



Fratereula arctica (Linn.) — Puffin. — Breeds abundantly. 

 Most numerous at the west end, according to Barrington, but 

 we also found great numbers on the north peninsula. Swin- 

 burne speaks of it as " swarming." 



Plialacrocorax graculus (Linn.) — Shag. — Abundant. None 

 of the larger species noted by any of the parties. 



Sula bassana (Linn.) — Gannet. — Breeds on Sulisgeir, and 

 Swinburne speaks of " 2000 to 2500, and in some years as 

 VOL. IX. u 



