. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. 175 Chickering, jr., found it at Hampton beach, N. II., in 1871. The following rude map illustrates the gradual dispersion of this species from Maine southward, with the year of its occurrence marked at the different EXPLANATION OF MAP. P., Portland, Maine; Pkov., Provincetown, Mass; W. H., Wood's Holl. Iii 1872, it was observed simultaneously at Salem, Mass., and Provincetown on the end of Cape Cod. This Cape seemed to form a barrier for some time to its passage south, and after rounding the Cape, its pro
. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. 175 Chickering, jr., found it at Hampton beach, N. II., in 1871. The following rude map illustrates the gradual dispersion of this species from Maine southward, with the year of its occurrence marked at the different EXPLANATION OF MAP. P., Portland, Maine; Pkov., Provincetown, Mass; W. H., Wood's Holl. Iii 1872, it was observed simultaneously at Salem, Mass., and Provincetown on the end of Cape Cod. This Cape seemed to form a barrier for some time to its passage south, and after rounding the Cape, its progress was much slower. Its occurrence at Wood's Holl being observed in 1875, and only the past year had it got as far as New Haven. A study of the ocean currents north of Cape Cod, which have a southerly course, will account for the rapid dispersal of this mollusk from Maine to Provincetown, Mass.; while the currents which set easterly south of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Essex Institute. 1n. Salem, Mass. , Essex Institute
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