...Identify the reproductive organs or gonads of the hydra... 
Worrallo Whitney 「A Guide for the Study of Animals」
...The Nanomia (), our free floating Hydroid, consists, when firstformed, of a single Hydra containing an oblong oil bubble ()...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...The tentacles differ in structureas well as in number for each kind of Hydra...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...In the first set which we will examine the Hydra is open-mouthed...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...Visit to Hampstead—Small ponds—Water-Fleas—Water-Beetle—Snails—Polyps—Hydraviridis—The Dipping-tube—AGlass Cell—The Hydra and its Prey—ChydorusSphæricus and Canthocamptus...
Henry J. Slack 「Marvels of Pond-life」
...Watching the hydra it was curious to note thechanges of form which these creatures are able toassume...
Henry J. Slack 「Marvels of Pond-life」
...The, or hydra, is found in clear waters, and may generally be seen in great plenty in small ditches and trenches of fields, especially in the months of April and May...
Samuel Griswold Goodrich 「Illustrative Anecdotes of the Animal Kingdom」
...ButI am too familiar with the hydra of error to expect that by loppingoff one of the monster’s heads I can prevent another, or eventhe same, from sprouting again...
Sir James George Frazer 「The Golden Bough」
...Before these develop the hydra resembles an ascula (Figs...
Ernst Haeckel 「The Evolution of Man」
...
Athenaappears here as a spectator, though she has no part in the pedimentalgroup; but in every other point, in the drawing of theHydra, of Herakles and Iolaos, the identity is almost complete...
Various 「The American Journal of Archaeology, 1893-1」
...The Crow is represented as standing on,and pecking at, the coils of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...The star Alkes is common to Hydra and Crater, and may be seen 24°southeast of Alphard in the heart of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...Situated in the heart of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...Following the order of right ascension, we come nextto the little constellations Crater and Corvus, which maybe described as standing on the curves of Hydra ()...
Garrett Serviss 「Pleasures of the telescope」
...Farther east in Hydra, as indicated near the left-handedge of , is a somewhat remarkable variable,R Hydræ...
Garrett Serviss 「Pleasures of the telescope」
...The geometrichead of Hydra is easily discernible east of Procyon: The star γin the Virgin is double, with a period of 145 years...
Henry Warren 「Recreations in Astronomy」
...The constellations Crater, the Cup, and Corvus, the Crow, both standon the coils of Hydra, south of Denebola, the bright star in the tailof the Lion...
William Tyler Olcott 「A Field Book of the Stars」
...Regulus lies about 9° east of Acubens, in Cancer, andabout 12° northeast of Alphard, in the heart of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
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