The porifera and coelentera . Theumbrella is square in section and rounded above ; a broad velarium,containing endodermal canals and suspended by four perradialfrendae, or thickenings of the subumbrella, is present in many forms(Cliarybdaea), but is sometimes absent (Procharagma) or slightlydeveloped (Procharybdis). The manubrium is four-square, its angles lying perradially. Four inter-radial tentacles, long, hollow, and cylin-drical, are always present; they aregenerally seated on lappets {pedalia),which in some cases carry numerousadditional tenticles (Chirodropus)..

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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora