Medusae of the world . Fig. 219.—Rhopalonema vclatum, after Agassiz and Mayer, in Mem. Museum of Comp. Zool. at Harvard College. Fig. 220.—Rhopalonema polydact\lum, after Haecke!, 1879. Fig. 221.—Rhopalonema cozruleum, after Maas, in Hydromedusen Siboga Expedition. die-shaped gonads, extending along the middle of inner thirds of the 8 radial-canals. Velumlarge. Stomach very short. Mouth with 4 simple lips. Bermudas to Sargasso Sea, tropicalAtlantic. Described by Maas from preserved specimens. The flat, expanded shape of the bellmay be due to unnatural distortion. (See text-figures 224.) 222. 2
Medusae of the world . Fig. 219.—Rhopalonema vclatum, after Agassiz and Mayer, in Mem. Museum of Comp. Zool. at Harvard College. Fig. 220.—Rhopalonema polydact\lum, after Haecke!, 1879. Fig. 221.—Rhopalonema cozruleum, after Maas, in Hydromedusen Siboga Expedition. die-shaped gonads, extending along the middle of inner thirds of the 8 radial-canals. Velumlarge. Stomach very short. Mouth with 4 simple lips. Bermudas to Sargasso Sea, tropicalAtlantic. Described by Maas from preserved specimens. The flat, expanded shape of the bellmay be due to unnatural distortion. (See text-figures 224.) 222. Fig. 222.—Rhopalonema cceruleum, after Haeckel, 1879. Fig. 223.— Rhopalonema funerarium after Vanhoffen, in Tiefsee Expedition, 224.—Rhopalonema striatum, after Maas, in Ergeb. Plankton Expedition. Side view above, oral view below. 382 MEDUSA OF THE WORLD. Rhopalonema clavigerum. Plate 49, figs. I to 1. Marmanema clavigerum, Haeckel, 1879, Syst. der Medusen, p. 263, taf. 17, fign. I, 2.—Maas, 1893, Ergeb. der PlanktonExpcd., Bd. 2, , p. 13. The bell is hemispherical, with a bluntly-rounded, apical projection, and about 7 16 tentacles, 8 of which are radial and are 2 to 3 times as long as the bell-diameter, withswollen, tapering, club-shaped, ciliated outer ends. The 8 interradial tentacles are mereslender, short, filiform cirri about half as long as the bell-radius. 8 lithocysts close to the sidesof the 8 interradial cirri. Viewing the medusa from the oral side so as to look into the bell-cavity, the lithocysts are always in the direction in which the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcnidari, bookyear1910
