Medusae of the world . ng medusa. — In the youngest medusa observed the bell was about 5 mm. in heightand about twice as high as it was broad. There were only 4 radial tubes. There were 8 long tentacles with conical, hollow, basalbulbs and about 16 slender addition to these there were about12 lithocysts each containing 2 to 3concretions. As development pro-ceeds the bell becomes relatively flat-ter. The radial tubes increase innumber, so that specimens of 25mm. diameter have about 12 periphery of the stomach inthese young medusae is irregular inshape, but when the animal is
Medusae of the world . ng medusa. — In the youngest medusa observed the bell was about 5 mm. in heightand about twice as high as it was broad. There were only 4 radial tubes. There were 8 long tentacles with conical, hollow, basalbulbs and about 16 slender addition to these there were about12 lithocysts each containing 2 to 3concretions. As development pro-ceeds the bell becomes relatively flat-ter. The radial tubes increase innumber, so that specimens of 25mm. diameter have about 12 periphery of the stomach inthese young medusae is irregular inshape, but when the animal is about50 to 60 mm. in diameter it becomescross-shaped, the radial tubes arisingfrom the ends of the arms of thecross. At about this time the genitalorgans develop upon the radial-canals. New radial tubes arise fromthe periphery of the stomach andextend downward toward the circu-lar vessel. This rare medusa is occasionallyfound along the New England coastfrom Massachusetts Bay to GrandManan, from July until f Figs. 183 and li^.—Halopsis ocellata, after A. Agassiz, in North Ameri-can Acalephae. 183, oral view; 184, bell-margin. Genus jEQUOREA Peron and Lesueur, 1809. Medusa icquorea, Forskal, 1775, Descript. animalium, p. no; 1776, Icones rerum natural., plate 32. /Equorea, Peron et Lesueur, 1809, Ann. Mus. Hist. Nat., tome 14, p. 336—Lamarck, 1816, Hist. Nat. Anim. sans Vert., tome 2, p. Mesonema, Eschscholtz, 1829, Syst. der Acalephen, pp. 108, 112.—Maas, 1905, Craspedoten Medusen der SAoga Exped., Monog. 10, pp. 40, +Crcmatostoma + Mesonema+Rliegmaiodes + Rhacostoma, Agassiz, L., 1862, Cont. Nat. Hist. U. S., vol. 4, pp. £quorea+ Rhegmalodes+ Mesonema+ Polycanna, Haeckel, 1879, Syst. der Medusen, pp. 218, 221, 225, , Claus, 1881, Arbeit. Zool. Inst. Wien, Bd. 3, p. 283; 1883, Untersuch. iiber Organisation und Entwick. der Medusen, p. 80.—Browne, 1903, Bergens Museums Aarbog, No. 4, p. 20.—Bigelow, 1909, Mem.
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