Abstract
It has been of considerable interest for the writer to learn that oncospheres are not all produced in the same way. The kind of embryo and the manner of its production are related to taxonomic position of the genus. In the present series of papers the morphology and development of a typical dilepidid hexacanth embryo will be described as a probable pattern for certain genera of the family Dilepididae. The complete hexacanth embryo (Fig. 18) was an oncosphere which retained the embryonic epidermis that later developed prominent epidermal glands (Reid, 1948; Ogren, 1955, 1957).
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