Grid Mammals Changes in mammal populations since previous cruises would seem quite significant. In the north section mammals were conspicuous by their absence. Where on previous cruises we would normally see up to thirty Fur Seals (Callorhinus ursinus) only four were identified. Two additional seals were unidentified. No other mammals were seen in the north section. The central section was heavily populated with mammals. Seals were represented by one bull Elephant Seal (Mirounga angustirostris), an unidentified sea lion, and two unidentified Otarids. Whales were numerous and included what was believed to have been a Baird's Beaked Whale (Berardius bairdii). Twenty-nine Sperm Whale (Physter catodon) and 28 Pilot Whales (Globi- cephala scammonii) were also identified. All the Sperm Whales were travelling in a northward direction. Porpoise in the central section were of two identified species. Fourteen Bottle-nosed Dolphin (Tursiops truncatus) were seen in two groups, each time in company with another species( Pilot whale and Risso's Dolphin). Five Risso's Dolphin ( Grampus griseus) were tentatively identified and photographed. In addition to those photographed, five unidentified porpoise were seen. The south section also had a good number of mammals. Otarids were represented by two unidentified sea lions. Twenty five Pilot Whales and five Sperm Whaleswere also seen. Porpoise were numerous, but most were unidentified. Those which were well seen included Bottle-nosed Dolphin,(3), Risso's Dolphin (5), 12 Striped Dolphin (Lagenorhynhus obliquidens) and two Baird's Dolphin (Delphinus delphis). The latter two species were in the same school, as were the Risso's and Bottle-nosed Dolphin. Of the 53 unidentified por-