The porifera and coelentera . Fio. 27. Siphonia tulipa, aiict. (after Zittel). A, a vprtical section of the body, natural size, showinnthe small gastral cavity, the radially directed incnrrent canals, and the concentrically disposedexcurrent canals. H, the entire sponge, half natural size. colony assumes a compact or bushy form (Fig. 3), which may takeon a spreading or an arborescent growth by variations in the mode.

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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora