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Two new genera and species of dinoflagellates are described. Both were originally isolated from plankton samples collected at La Jolla (San Diego, California).2. Scrippsiella sweeneyi is a small species with the general tabulation of an Orthoperidinium, but it differs in having six cingular plates. The structure of the sulcus is also different. A great deal of variation in plate pattern was exhibited by this organism.3. Fragilidium heterolobum is a medium-sized species having a tabulation that is quite different from all previously described dinoflagellates. It has a very high number of cingular plates (twelve). The generic name refers to the characteristic frequency and suddenness with which it sheds its plates.
Enrique Balech (Wed,) studied this question.
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