. Chambers's encyclopedia; a dictionary of universal knowledge for the people. sof Madrei)ora are delineatetl in the articles Coraland Madrepore. Amongst the most importantworks on this department of zoology may bementioned Danas Structure and ofZoophytes (Philadelphia, 1846), and his Report onZooiihijtes, and Atlas ojf Zoophytes ( ExploringExpedition), 1849 ; Johnstons British Zoophytes, in2 vols., to which we are indebted for many of ourillustrations ; Milne-Edwards and Haime, HistoireNaturelle des CoraUiaires ou Polypes proprementdits (3 vols., 1857—186(3); and Lacaze-Dut
. Chambers's encyclopedia; a dictionary of universal knowledge for the people. sof Madrei)ora are delineatetl in the articles Coraland Madrepore. Amongst the most importantworks on this department of zoology may bementioned Danas Structure and ofZoophytes (Philadelphia, 1846), and his Report onZooiihijtes, and Atlas ojf Zoophytes ( ExploringExpedition), 1849 ; Johnstons British Zoophytes, in2 vols., to which we are indebted for many of ourillustrations ; Milne-Edwards and Haime, HistoireNaturelle des CoraUiaires ou Polypes proprementdits (3 vols., 1857—186(3); and Lacaze-Duthiers,Histoire Naturelle du Coruil, Onjanisation, liepro-duction, Ji-c. (1864). POLYPODIUM, a genus of Ferns, with spore-cases on the back of the frond, distinct, ring-shaped,in roundish sori, destitute of indvsiwn. Severalspecies, differing very considerably in ajipearance,are natives of Britain, wliere no fern is morecommon than P. vuhjare. It grows on rocks, trees,dry banks, &c., and has fronds 2—18 inches long,deeply pinnatifid, with large sori.—P. Dryopteria^. Polypodium:1, P. dryopteris; 2, P. vnlgare. with delicate ternate bipinnate , is found onmany dry stony places in the northern United States.—P. Calaijuala, a native of Peru, is said to possess POLYPORUS-POLYTECHNIQUE. important medicinal properties—solvent, deobstrucnt,sudorific, &c. POLYPORUS. See Amadou and Duy Rot. POLYPTEKUS, a cenus of fishes h(lon!j;inptcfy(p<i,\vh\(:h is characterised l)y the pres-ence of lioniologues of ordinary liiiih hones in the axialparts of the fins. The neinis was constituted l)y Miil-ler and otlicrs into a Ianiily, rolyptcrUicf, of the dis-cardcii order of Ganoid Fislies. ]he shape is round andelou_2:ated ; the head defended by large bony plates,the l)ody covered with large and strong ganoidscales, which are very closely affixed to tlie curious fishes, existing remains of a typewhich was prevalent in former geologic periods,inhabit the rivers of Africa,
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