On the bicoecidae: a family of colourless flagellates

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Abstract
Two distinct species appear to have been confused by James-Clark in his original description of Bicoeca lacustris . The two forms have been re-examined and photographed. It is suggested that the differences between them justify their separation into two species, as suggested by Stoic, the one form to retain the name B. lacustris , the other to receive that of B. vacillans Stoic. A new species, B. maris , is described, and the affinities of the Bicoecidae, Bodonidae and Craspedomonadidae are discussed.