Medusae of the world . Fig. 295.—Pegantha martagon (young medusa), after Bigelow, in Zool. at Harvard College. Upper half gives appearance of contracted bell, while lower half shows 296.—Pegantha martagon (young medusa), after Bigelow, in Bull. Mus. Comp. Zool. at Harvard 297.—Pegantha triloba, after 298.—Pegantha dactyletra, after Maas, in Ergeb. Plankton Expedition. The 18 oval lappets are about half as broad as long and alternate in position with 18 ten-tacles which project stiffly from the sides of the bell, their roots being inserted


Medusae of the world . Fig. 295.—Pegantha martagon (young medusa), after Bigelow, in Zool. at Harvard College. Upper half gives appearance of contracted bell, while lower half shows 296.—Pegantha martagon (young medusa), after Bigelow, in Bull. Mus. Comp. Zool. at Harvard 297.—Pegantha triloba, after 298.—Pegantha dactyletra, after Maas, in Ergeb. Plankton Expedition. The 18 oval lappets are about half as broad as long and alternate in position with 18 ten-tacles which project stiffly from the sides of the bell, their roots being inserted in the zone ofthe deep ring-furrow which separates the central, apical, disk-like part of the bell from themore marginal zone of the 18 lappets. These tentacles are of uniform length and taper gradu-ally from base to tip. They are about as long as the bell-diameter; their entoderm consists of asingle row of chordate cells, placed coin-like one after another in an axial row. The roots of thetentacles taper inwa


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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcnidari, bookyear1910