Medusae of the world . short and Plate 30. Fig. 1. Obelia dichotoma. Magnified view of a part of the hydroid. Agassiz Laboratory, Newport, Rhode Island, June 28, 2. Obelia dichotoma. Magnified view of one of the polypites of fig. 3. Obelia dichotoma. Magnified view of one of the medusa; immediately after being set free from the hydroid represented in figure 1. The gonads are now adjacent to the 4. Obelia dichotoma. The medusa 3 days after being set free from the hydroid, showing how the gonads have migrated outward down the 5. Medusa of Obelia s
Medusae of the world . short and Plate 30. Fig. 1. Obelia dichotoma. Magnified view of a part of the hydroid. Agassiz Laboratory, Newport, Rhode Island, June 28, 2. Obelia dichotoma. Magnified view of one of the polypites of fig. 3. Obelia dichotoma. Magnified view of one of the medusa; immediately after being set free from the hydroid represented in figure 1. The gonads are now adjacent to the 4. Obelia dichotoma. The medusa 3 days after being set free from the hydroid, showing how the gonads have migrated outward down the 5. Medusa of Obelia sp. Showing the bell inverted. This attitude is often assumed by the young medusa. Newport, Rhode 6. Medusa of Obelia sp. Oral view of mature medusa. Newport, Rhode 7. Stomotoca ptcrophylla, Nassau Harbor, Bahamas, April 20, 1907. Natural size. Normal aspect of the medusa. Compare with figure 3, plate 29. See page 113; volume 1, for description of figure from life, by the author. PLATE 30. —OBELIA. 247 has 4 lips. The gonads are very small and oval and are near the middle points of the 4 radial-canals, but somewhat nearer margin than stomach. Gonads and stomach faint yellowish-brown or brown. These medusae lived more than a month in Brownes aquaria at theFirth of Clyde, Scotland, the water in the aquarium being constantly stirred by the plunger. Obelia australis von Lendenfeld. Obelia australis, von Lendenfeld, 1884, Proc. Linnean Soc. New South Wales, vol. 9, pp. 604, 920, plate 43, figs. 19-22.—Bale, 1888, Proc. Linnean Soc. New South Wales, ser. 2, vol. 3, p. 753, plate 12, figs. I, 2.—Farquhar, 1896, Zealand Institute, Wellington, p. 460.—Hartlaub, 1901, Zoolog. Jahrbuchern, Abth. Syst., Bd. 14, p. 367; Ibid.,1905, Suppl. 6, p. 580. According to von Lendenfeld, the stems of the hydroid are creeping and adnate to foreignbodies to which the stem clings like a hydrorhiza. This creeping stem is about 12 to 16
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcnidari, bookyear1910
