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A new species of Dinophilus was found in the summer of 1897, by Dr. E. G. Gardiner, at Woods Holl [sic]. The pool in which it is found is an artificial one, 12 by 14 feet, dug about eight years ago to obtain the peat in the marsh. Sea water does not flow into it, but when the tide is unusually high it percolates in through the sand. The salinity of the water is therefore subject to great variation, for a run of low tides results in condensation through evaporation, while heavy rains dilute it. In May, 1898 and 1899, Dinophilus was found by Dr. Gardiner in abundance upon green algae floating on the surface of the water. In June, 1898, he kindly brought the animal to my notice and I began work upon it.