Abstract
The periodic production of the sexual cells of Dictyota has been described for Bangor, Wales, and Plymouth, England, by Williams (1905); for Beaufort, North Carolina, by Hoyt (1907); and for Naples, Italy, by Lewis (i9io). Further studies have now been made at other places on the coast of North Carolina, at Naples, and on material obtained from Jamaica, and some additional facts have been observed. While these do not seem to explain the phenomenon, they furnish material which must be considered and offer suggestions as to the possible nature of the problem. At all places where studies have been made, all observed species of Dictyota produce their sexual cells in periodic crops at intervals more or less definitely related to the tides of each region. The relation to the tides varies, however, in different localities, and three different types of periodicity have been observed: one shown by Dictyota dichotoma at Bangor, Wales; Plymouth, England; and Naples, Italy; the second shown by all observed species of Dictyota on the shore of Jamaica; and the third shown by the species of Dictyota resembling D. dichotoma occurring at several places on the coast of North Carolina. RECORDS
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