16 PROCEEDINGS OF THE NATIONAL MUSEUM 



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Figure 9. — Computer printed distribution maps of two color phases of wedge-tailed shear- 

 waters May-July. Four-digit numbers in extreme left margin refer to Cromwell cruises 

 by month and year on which first observation in that line was made. Note that, on 

 April and July cruises, observations were made in May and August. North is to the 

 left, latitude is read from right to left, and longitude from top to bottom. The cruise 

 track is outlined by the number print-out. Asterisks indicate no observations were made 

 in that half-degree square, 00 indicates observations but no birds. Abundance may 

 be read directly from the printed numbers. Circles indicate 20 birds or more per half- 

 degree square. 



