AUSTRALIAN FAIRY-PRION. 
of breeding. Such subspecies usually flock together at sea, and this would 
account for the manner in which they are washed up after storms. When sub- 
species of different forms breed together on the same island or group of islands, 
it will be generally found that they frequent separate localities or different 
rocks. The bill, when the young is fully fledged, is practically the same length 
as in the adult, but is much weaker ; the wing is noticeably shorter, as also 
the legs and feet ; as the bill becomes stouter a corresponding growth is 
recorded in the wings and feet. The adult is easily separated from P. turtur 
turtur by its stronger bill and larger size. I am unable to separate the bird from 
Stephens Island, for want of more material, and have associated it with this 
form for the present. 
P. turtur crassirostris, subsp. n. ; Bounty Islands. 
Specimens from this island are noteworthy in their larger size and extremely 
powerful bill. Though the bill is not much longer than in the preceding form, 
it is much deeper and altogether more massive, while all the specimens agree 
in being larger. A solitary specimen from the Snares seems to be intermediate 
between this and the preceding, so may represent yet another subspecies. 
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