The shell-heaps on the Atlantic coast long since attracted notice. Dr. C. T. Jackson, and afterwards Professor Chadbourne, visited the remarkable one at Damariscotta, in Maine; Sir Charles Lyell has particularly described another on St. Simon’s Island, in Georgia,[2] and quite recently Mr. Charles Rau, of New York, has given a full and instructive account of the examination of another at Keyport, New Jersey.[3] We have ourselves examined two on the sea-coast of East Florida, and still others in considerable numbers on the banks of the upper St. John’s, in the same State. These last-mentioned heaps consist wholly of the shells of fresh-water species. We may have something to say of them hereafter, but at present shall only speak of such as were visited on the coast of Maine and Massachusetts during the summer and autumn of the year just passed. Of the localities where these are situated, and of the structure of the heaps, we shall speak as briefly as possible; but shall enter somewhat fully into details, in connection with the implements and the remains of animals found in them. It is to be understood, however, that the heaps here described are only a very small portion of those to be seen along the coast of these two States, and which offer an ample reward to any who will take the trouble to examine them. II. _Frenchman’s Bay._ Mount Desert is the largest of the islands on the indented coast of Maine, and forms the western shore of Frenchman’s Bay. Many shell-heaps are scattered over this and the adjoining islands and the main land. Williamson,[4] without particularly designating them, mentions the existence of several from one to two acres in extent, and states that “a heavy growth of trees was found upon them by the first settlers.” We have examined two. The first of these is in Gouldsboro’, on the main land, and near the water’s edge on the eastern shore of the bay. It is said to cover an acre of land, but being under cultivation was examined only near its border, where a pit was sunk showing a deposit of clamshells about two feet in thickness. Among these were found the bones of several animals, including those of the deer, elk, and beaver, but no implements of any kind. Stone implements have, however, been found by those who have cultivated the soil of this neighborhood.