MARINE MAMMAL OBSERVATIONS EAC 38 Observations of marine mammals during this partial Eastern Grid Survey (northern half) were few. Only two species of cetaceans and one or possibly two species of pinnipeds were logged. The cetaceans consisted of two groups of 6-9 Killer Whales (Orcinus orca) and two small groups of ca. 12 of Common Dolphins (Delphinus sp.). The latter were of interest as they were the offshore type we have noted with dorsal fins colored differently from the usually more inshore Delphinus. The only other locality where this offshore form occurs is in Japanese waters. We are currently corre- sponding with Japanese cetologists about the color forms and distribu- tion of this genus in Japanese waters. Pinnipeds recorded were even fewer than the meagre assemblage of cetaceans in the Grid. The Northern Fur Seal (Callorhinus ursinus) was observed on five different occasions. Four of these observations were of single animals, with one sighting of two recorded. Another fur seal noted was possibly the Guadalupe Fur Seal (Arctocephalus townsendi). Two seal species and four eared seals were all single observations except for one sighting of two. Weather and sea conditions were such that marine mammals had to be relatively close to the ship to be seen. Large Baleen and Sperm Whales which have been sighted in the Grid throughout the year were not noted (possibly due to sea conditions). GRID MARINE MAMMAL OBSERVATIONS 24 March 1968 1045 eared seal - 2, probably Northern Fur Seal 1403 seal sp. - 1 1426 seal sp. - 1 1443 eared seal - 1, probably Northern Fur Seal 1458 eared seal - 1, probably Northern Fur Seal 1745 Killer Whale - 6-9 These Orcinus were in three groups with at least two per pod. Each group had one large male (ca. 25 ft.).