Annotated List 
At Sea Observations - U.S.S. Tawakoni 
Oct. 3 - Oct. 8 1963 
1. Puffinus pacificus Seen daily throughout the trip. General 
decrease of numbers until Oct. 5 and subsequent increase -with 
larger proportion of dark phase birds may indicate two different 
pelagic populations. 
2. Puffinus nativitatus Due to general inexperience of observers 
specific identification of dark shearwaters was difficult. Sibley 
identified several on Oct, 7* 
3. Puffinus griseus One unquestionable sight identification on 
Oct. 6 by Clapp and Sibley. Another, possibly this species, was 
seen on Oct. 8. 
4. Pterodroma sp. Bonin Petrels were seen with some regularity 
after leaving Oahu. One was collected by Sibley and Bratley at 0907 
Oct. 7, 1963. Several other birds belonging to the genus were seen 
but generally under conditions in which collecting was impossible. 
5. Oceanodroma castro Two birds of this species were seen on Oct. 8. 
6. Oceanodroma sp. A very small dark bird with a rapid wing beat was 
seen on Oct. 4 and may possibly have been the Sooty Storm Petrel. 
7. $ulweria bulwerii One was seen Oct. 6, three Oct. 7 and two 
Oct. 8. 
8. Phaethon lepturus This species was seen intermittently throughout 
the trip. A total of 6 observations, the one furthest south at 
approximately 6 14«N. latitude and at 171 31 W. longitude. 
9. Phaethon rubri cauda Seen on Oct. 5 and on Oct. 8. The first 
observation was at approximately 13 48' N. latitude and 164 20' W 
longitude 
