. Southern invesrtebrates on the shores of Acadia [microform]. Invertebrates; Aquatic invertebrates; Invertébrés; Invertébrés aquatiques. 178 .( HI Wk-. W. F. ON SOUTHKRN INVERTEBRATES current is much more strongly felt ' and nearly all of the southern forms first thin out and then totally disappear. A curious condition is presented to us by Sable Island, which lies directly in the path of the icy-cold Labrador current. Yet the island bears a marked colony of southern mol- lusca. Th(! explanation of their persistence there is undoubtedly to be Ibund again in the great sandy shoals and
. Southern invesrtebrates on the shores of Acadia [microform]. Invertebrates; Aquatic invertebrates; Invertébrés; Invertébrés aquatiques. 178 .( HI Wk-. W. F. ON SOUTHKRN INVERTEBRATES current is much more strongly felt ' and nearly all of the southern forms first thin out and then totally disappear. A curious condition is presented to us by Sable Island, which lies directly in the path of the icy-cold Labrador current. Yet the island bears a marked colony of southern mol- lusca. Th(! explanation of their persistence there is undoubtedly to be Ibund again in the great sandy shoals and A'ery slight tides of the region. The waters on these miles of shoals must be heated by the sun, and this heated water is not mixed with colder by tidal cur- rents, - the movement of the main Labrador current being too slow on the shoals to supply cold water faster than it can bi; ht'atcd. Sable Island stands upon a great bank, which is one of a long series extending from the Grand Bank of Newfoundland on the north to St. George's Bank, ofi" Cape Cod on the south, and so numerous are they that they form an almost unbroken line from their northern to their southern limits. The depth of water varies from zero on Sable Island bank down to sixty fathoms, a general average; b-ing about iiO to 40 ftithoms. Their extent, position and depths are shown upon all modern charts of this region. There is deep water, one hundred fathom and more, to the westward between them and Nova Scotia, and on their outer faces they sink down to considerable depths. They are swept by the cold Labrador current, as is shown by the Arctic character of their f\iuna, and are a most important eleiucnt in the problem we are discussing. Passing in the next place to the Bay of Fundy, we find in general bold and rocky shores with an almost entire lack of shoals, and strong tides which vary from 12 feet at its mouth to over 50 at its head. Just outside of Nova Scotia the Labrador current sweeps southward an
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