Mammals Nine hundred thirty-nine mammals recorded in the Grid area (all but two were Cetacea). Dolphins This was the most abundant mammal in the Grid area with a total of 677 individuals recorded. One specimen was obtained 27 August at 34°20' N, 126°27' W. Complete measurements and photos were taken of this animal, and the skeleton roughed out and saved. Great variance in coloration of extremities has been noted during past surveys. During this survey the animals recorded had small amounts of "dirty white" in the dorsal and on the flippers, whereas those seen and photographed on earlier cruises had brilliant white markings. The explanation of the change is believed to be one of two factors: 1) The mammals recorded in the area earlier have moved out of the Grid area, probably north or northwest, and those recorded on this survey were arrivals of another population (probably southern as northerly movements are evident); or 2) The white coloration is a secondary sexual characteristic which is becoming poorly defined in the "nonbreeding seasons." We have had extensive correspondence with Cetologists on the West Coast and none can offer an explanation to this problem. Lissodelphus The appearance of this animal in the northern section of the Grid suggests that the southerly movements of the species are beginning. Orcinus A pod of 25+ "killers" was seen at 34°53' N, 123°19' W. Loosely associated with this pod were two animals which showed large amounts of albinism. The animals were chased for some time and well-observed. Photos were taken by tug crewmembers and hopefully will be of value. Whales Baleen whales still predominated in the area. The concentration of all whales was in the northern section of the Grid area. That the largest of the Balaenoptera are remaining in the area indicates relatively large planktonic concentrations in these northern waters. These large animals would leave unrich waters to seek food were it not abundant here. Non-Grid Observations are summarized in Table 8. The presence of large numbers of Sterna just outside the Grid near Point Ash is worthy of mention. All other interpretations are left to the reader if he will refer to Tables.