THE BIRDS OF AUSTRALIA. 
suggest that the Recherche Archipelago, for instance, might harbour large 
colonies of such little night-birds as these without risk of discovery from 
unskilful observers. It seems reasonable to conclude that some near nesting- 
place should be responsible for the occurrence of these strange forms in West 
Austrahan waters, as so far almost all the Westrahan Petrels have been different 
from Bass Strait forms, and the recent discovery of the Westralian breeding- 
form of P. macroptera points to many more interesting finds to be made on 
the islets off South-west Australia. 
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