found at Igurin and Japtan (Fig. 8) where activity was more or less similar in the two groups. Comparisons of pre-shot activ- ity at other stations indicate the omnivores to be 2 to 7 times as radioactive as the carnivores. Comparisons of post shot activity indicate the greatest difference existed at Engebi, where omnivores were about 32 times as radioactive as carnivores, and at Aaraanbiru where omnivores were about 30 times as active. The data indicate that ratio of radioactivity, omnivores to carnivores, was greater at Aaraanbiru and Engebi than at Japtan and Igurin, which is further substantiated by comparing like tissues of carnivores and omnivores. At Japtan and Igurin comparatively small amounts of pre-shot radioactive material were taken into the gut of either omnivores or carnivores, and approximately equal amounts were retained in the muscle, skin, bone and liver. On the other hand, at pre-shot and post shot islands, where the activity was comparatively high, the omnivores took in considerably more radioactive material in feeding than the carnivores but retained proportionately less in the liver, bone, skin and muscle. Por example, at Engebi and Aaraanbiru the activity in the gut of omnivores was approximately 21 times and 125 times as great, respectively, as in carnivores, yet the radioactive materials retained in the muscle, skin, and bone ranged from only 2.5 to 7.2 times as much in omnivores. It should be pointed out, however, that because of the great variation in activity of the gut both within and between species, any conclusions made should take this factor into consideration. - 51-