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Histoire naturelle du corail Pl. XIX . EXPLICATION DES IMANCHES PLANCHE XX VARITS DU CORAIL Fig Polypier de la punlarcUe ilont oa vu le dessin planche figure Il est form de trois laines limitant entre elles des angles didres et couvertes de spicules agglomrs saillants sur ses bords et sur ses faces Hcj spicule enferm dans