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3 considerable rarity. From the Museum of Comparative Zoology, Cambridge Mass., two species of crayfishes from Indiana and Vermont. From Charles F. Pond, Lieut. U.S.N., U.S.S. Ranger, 7 sponges and one nullipore from the islands off Lower California . From Dr. Alfred Dugis, one sea-urchin, one shrimp, and a few amphipods and worms, for examination and report. Through the department of Mollusks, an interesting addition to the Sea collection received two years ago. It consists of several