Occasional papers of the Boston Society of Natural History . ounter currents. All of Long Island Soundexcept the bays and harbors of Long Island is also included in thisarea. The land mollusks also present many interesting features in dis-tribution, since Xew England is the northeastern limit of distribu-tion of many species, such as Polygyra palliata, Polygyra tridentata,Omphalina fuHginosa, Omphalina inornata, etc., species commonto the mountains of North Carolina and Tennessee. We can tracethese species back and find that their line of dispersal from thatregion was probably first northward
Occasional papers of the Boston Society of Natural History . ounter currents. All of Long Island Soundexcept the bays and harbors of Long Island is also included in thisarea. The land mollusks also present many interesting features in dis-tribution, since Xew England is the northeastern limit of distribu-tion of many species, such as Polygyra palliata, Polygyra tridentata,Omphalina fuHginosa, Omphalina inornata, etc., species commonto the mountains of North Carolina and Tennessee. We can tracethese species back and find that their line of dispersal from thatregion was probably first northward along the western ridges of theAlleghanies into central Xew York and thence eastward along thevalleys of the Mohawk and Hudson Rivers into western NewEngland. The distribution of Helix hortensis, confined to theislands and headlands of the coast, strengthens the theory ofbotanists and others of a large continuous land area to the eastwardin comparatively recent geological times. Of the species from deep water, only those actually taken within 6 FArXA OF NEW E^XTL-•VXD. the described area have been included, and as the Society has veryfew of those found below 50 fathoms, I have been unable to verifj-a large number of the species recorded. The list contains 738species and 71 varieties. Those marked T^dth an asterisk are inthe collection of the Society and additions to the Xew Englandcollection are especially desired. In the work of preparing this list the T^Titer is indebted to FrancisN. Balch, Esq., for the list of Xudibranchs, to Dr. Henrj^ B. Bigelowfcr many of the records of the Pteropods, to Dr. V. Sterki for assist-ance with the Sphaeridae, and to Messrs. William F. Clapp, HenryW. Winkley, Owen Bryant, Olof O. Nylander, X. W. Lermond,and others for specimens and records of distribution. The variouscollecting trips made for the Society by Dr. Joseph A. Cushmanand the writer have not only added to our knowledge of distribu-tion, but have also greatly enriched
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