-4- A moderate number of large Pterodroma and Wedge-tailed Shearwaters were noted as well as fairly high numbers of Leach type storm petrels. The north and south boundary lines of this current are probably richer in ani- mal life available to birds than within the current itself. AREA D. SOUTH EQUATORIAL CURRENT WATERS Time span: 4-10 March and 20-23 March., Boundary limits: 4°N latitude to 11°-40 S latitude along 105°W longitude and 5°-30 N latitude to 2°-30' S latitude along 112°W longitude. Low numbers of all species except storm petrels were encountered through- out. Although Leach's Storm Petrels were abundant in this area as well as farther north, practically all of the Galapagos Storm Petrels were recorded here. AREA E. CENTRAL PACIFIC WATER MASS Time span: 11-19 March., Boundary limits: 11°-40 S to 20° S latitude along 105°W longitude and thence northwest and north along 112°W longitude to 20°-30'S latitmde. This area was characterized, and distinct from South Equatorial Current waters, by a deeper mixed layer, an increase in salinity and approximately a 1° C drop in surface temperature. The vast majority of southern hemisphere petrels were encountered with- in the bounds of this area. Red-tailed Tropicbirds and Fairy Terns also showed a center of abundance here. Sooty Terns and Wedge-tailed Shearwaters were abundant both in this area and along northern coastal waters with rel- atively none throughout the intervening waters. SPECIES ACCOUNTS (Note: only species which warrant pertinent discussion are included below. See Table 3 for total avifauna.) Pale-footed Shearwater (Puffinus carneipes) Sightings were usually of single individuals. One bird was shot down over an oil slick, only to get up again, fly through four more patterns and eventually outrun the skiff. Pink-footed Shearwater (Puffinus creatopus) Six of the nine sightings were recorded in large mixed feeding flocks. on 22 February at the mouth of the Gulf of California.