Medusae of the world . Fig. 267.—A, B, C, Liriope mucronata, showing successive stages in growth of medusa from z to10 mm. in diameter. D, Young Geryonia proboscidalis, 3 mm. in diameter. From life, by theauthor, Zoological Station, Naples, December, 1907. until they are half-grown medusa?. To recapitulate, these 12 tentacles are: 4 original, solid,exumbral, radially placed tentacles+ 4 secondary, hollow, marginal, radial tentacles+ 4 solid,marginal, interradial tentacles. Mature medusa? are often found with only the 4 hollow, radialtentacles remaining, the 8 others having been cast off. 416 M
Medusae of the world . Fig. 267.—A, B, C, Liriope mucronata, showing successive stages in growth of medusa from z to10 mm. in diameter. D, Young Geryonia proboscidalis, 3 mm. in diameter. From life, by theauthor, Zoological Station, Naples, December, 1907. until they are half-grown medusa?. To recapitulate, these 12 tentacles are: 4 original, solid,exumbral, radially placed tentacles+ 4 secondary, hollow, marginal, radial tentacles+ 4 solid,marginal, interradial tentacles. Mature medusa? are often found with only the 4 hollow, radialtentacles remaining, the 8 others having been cast off. 416 MEDUSAE OF THE WORLD. Liriope mucronata is the common Liriope of the Mediterranean, being abundant through-out the year at Naples. It is usually colorless. The peduncle flares widely at its base, but isvery narrow and only slightly tapering in the greater part of its length. The elongate, heart-shaped gonads are slightly narrower than the spaces between them. The measurements. Fig. 268.—Liriope hyperbolica, after Maas, in Ergeb. Plankton Expedition. Fig. 269.—Liriope rosacea, after Eschscholtz. Fig. 270.—Liriope compacia, after Maas, in Ergeb. Plankton Exped. =L. rosacea. (in millimeters) of a mature medusa from Naples are as follows: Bell, wide, high;peduncle, long; stomach, long; gonads, 3 long, wide; spaces between gonads, were only 4 interradial centripetal vessels. Liriope hyperbolica Maas. ( ?) Liriope lenuiroslris, Agassiz, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. -565. Non Glossocodon lenuiroslris, Fewkes, 1884, Mem. Mus. Comp. Zool. at Harvard College, vol. II, No. 3, plate 5, figs. 4-7 — Agassiz, A., 1888, Bull. Mus. Comp. Zool. at Harvard College, vol. 14, p. 186, figs. 94, 96.—Mayer, 1900, Bull. Mus. Comp. Zool. at Harvard College, vol. 37, p. 65, plate 24, figs. hyperbolica, Maas, 1893, Ergeb. der Plankton Exped., Bd. 2, , p. 38, taf. 2, fig. 4. Agassiz, 1862, gives a very brief and va
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