Abstract
ABSTRACT In 1868, in an interesting memoir2 on the marine Planarians of St. Malo, Keferstein figures an animal which he designates by the name “problematic parasite.” The explanation of the plate (plate ii, fig. 8) indicates that this parasite has been found several times, and often in great quantity, in the digestive tube of the Tremellaria (Leptoplana tremellaris). The text gives us no information as to this curious organism, and it is chiefly by means of the rather rough figure of the second plate of Kerferstein’s work that we are led to refer it to the group which we are about to study.
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