Plymouth Peridinians: I. Diplopsalis Lenticula and its Relatives

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Abstract
Much discussion has recently taken place over the peridinian described by Bergh (1882) as Diplopsalis lenticula, and certainly three distinct species have severally been designated as the original. As it is a name frequently to be found in the International Plankton lists, it is important that we should be clear as to which species we are noting, and as recent research at Plymouth has shown that all the three are common in the district it seems worth while to investigate them once more. The question is interesting also from the point of view of phylogeny, as in these species we have close relatives of Peridinium proper which seem to indicate the method of evolution of that genus from simpler forms with fewer plates, and from this point of view alone they are well worth study.

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