Bulletin of the Bureau of Fisheries . metimes occurring in almost incredible iitiiii-hers. Hydroid stock very similar to preceding species. Distribution as id preceding. Common everywhere. Obelia gelatinosa (Pallas). Serluiaria gelatinosa Pallas, Elenchus Zoophytorum, 1766, p. 116. Laomedia gelatinosa Lamarck. Animaux sans Vertebres. Tome II, 1817, p. 134. Lamouroux, Histoire des Polypiers Coralligenes Flexible. 1816, p. A. Agassiz, North American Acalephse, 1865, p. gelatinosa Haeckel. System der Medusen, 1879, p. ; I hi dichotoma Allman. Annals and Magazi
Bulletin of the Bureau of Fisheries . metimes occurring in almost incredible iitiiii-hers. Hydroid stock very similar to preceding species. Distribution as id preceding. Common everywhere. Obelia gelatinosa (Pallas). Serluiaria gelatinosa Pallas, Elenchus Zoophytorum, 1766, p. 116. Laomedia gelatinosa Lamarck. Animaux sans Vertebres. Tome II, 1817, p. 134. Lamouroux, Histoire des Polypiers Coralligenes Flexible. 1816, p. A. Agassiz, North American Acalephse, 1865, p. gelatinosa Haeckel. System der Medusen, 1879, p. ; I hi dichotoma Allman. Annals and Magazine of Natural History, Vol. Nil I. lstil. p. 372. Medusa much as preceding as to general form, tentacles, etc Tentacles at birth It; (Hincks), 24(Haeckel). Manubrium and gonads about as in preceding species. Development from hydroidstock of same name, which, in contrast to those of both the previous species, is very large, attaininga height of a foot or more. Distribution.—Less common than preceding, though taken throughout Obelia diaphana MEDUSAE OF WOODS HOLE REGION. 49 Obelia pyriformis (A. Agassiz.) Eueopepyriformis A. Agassiz, North American Acalephse, 1865, p. 88, Laomedia pyriformis Leidy, Murine Invertebrate Fauna Now Jersey and Rhode Island, in Journal Academy Sciem Philadelphia, 1855, p. pyriformis Haeckel, System der Medusen, 1879, p. 175. Medusa flat, discoid, with LM tentaclesat birth; gonads also present, at this period, pear-shaped and borne on proximal half of radial canals. ((tocysts s ewhat largerthan in some of the preceding species and usually slightly to one side of the tentacular base. Manubrium globular with simplemouth devoid of lobes or lips. Development.—From hydroid of same name, having its habitat chiefly on eel-grass nr in similarsurroundings. Distribution.—Somewhat general throughout the region. Obelia fusiformis (A. Agassiz.) Eucopi (?) fusiformis A. Agassiz, North American Acalephx, 1865, p. 90. Eucopt (?) divaricata A. Ag
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