4 Observations were conducted from the flying bridge or the bow depend- ing on the type of avifauna present (e.g., feeding flocks readily observed from the flying bridge, storm petrels readily identified from the bow). Observational emphasis was placed on sighting and identifying birds near the ship. As a result, more distant birds may have been often missed. For this reason the total number of categories of observation (e.g., those sightings categorized as shearwater/petrel, Pterodroma sp., and Tern sp.), are less than might be expected. DISCUSSION For purposes of analysis the cruise track was divided into six sec- tions. Each section was determined on the basis of the fauna present and in the most elementary way illustrates six different habitats encountered. It is hoped that when final breakdown of environment is available a more precise zoogeographic map of the area can be completed. A major fault with this preliminary division of the cruise track can be illustrated by area "E". This area covers roughly from 5°S to 20°S and 11 days of observations. Area "E" contains the outer edge of the Humboldt current where bird density was 1.159 birds per linear mile on the 3rd of March. But at 20°S the en- vvironment was virtually barren of life and density sank to .078 birds per linear mile. Each area is dominated by birds from certain land masses which may be close or far distant (e.g., area "B", around the Revilla-Gigedo Islands is dominated by birds breeding on these islands; area "D" in the equato- rial doldrums, where dominant birds were Leach Storm Petrels and Red Phalaropes from the Arctic). The daily analysis of each area is illus- trated in Tables 4-9. Area "A". 30°N to 20°N This area is influenced by birds from adjacent Baja California, and wintering birds from higher latitudes. The dominant species group was storm petrels, with gulls second. Shearwater/petrels were represented in this area by cold-water species or sub-species from the Baja coast and the Southern Hemisphere. Large areas of kelp and an abundance of cetaceans and pinnepeds are characteristic of this area. The average sunface temperature was 10°C. Appendix C contains a summary of observations along the Baja coast on March 23rd and 24th. Area "B". 20°N-114°W to 12°N-109°W Tropical seas surrounding the Revilla-Gigedo Islands and dominated by birds from these islands. The Townsend Shearwater, endemic to this area, was the most abundant bird species. Area "B" had the highest