...Identify the reproductive organs or gonads of the hydra... 
Worrallo Whitney 「A Guide for the Study of Animals」
... represents such a cluster innatural size, while shows a piece of the stem highly magnified,with a reproductive calycle attached to the side of a sterile Hydra stem...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...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」
...Like theoriginal Hydra, it is only a digestive tube, similar in all respects to theproboscis of a Medusa-disk...
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」
...
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」
...Lastly, toward the southern horizon, we must notice the Hydra, Eridanus,the Whale, the Southern Fish, the Ship, and the Centaur...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...The second isthe great watersnake, Hydra, which 4600 years ago stretched for 105°along the celestial equator of that day...
E. Walter Maunder 「The Astronomy of the Bible」
...The constellation resembles a goblet with its base resting on thecoils of Hydra...
William Tyler Olcott 「A Field Book of the Stars」
...Canis Minor and the Head of Hydra are also containedon ...
Garrett Serviss 「Pleasures of the telescope」
...—The head of Hydra, a striking and beautiful arrangement ofstars, lies just below the Bee Hive, in Cancer, 6° south of Acubens inthat constellation, and forms a rhomboidal figure of five stars...
William Tyler Olcott 「A Field Book of the Stars」
...In the Head of Hydra we find Σ 1245, a double of thesixth and seventh magnitudes, distance 10...
Garrett Serviss 「Pleasures of the telescope」
...In the central portion of Hydra,represented on , we find its leading star α, sometimescalled Alphard, or Cor Hydræ, a bright second-magnitudestar that has been suspected of variability...
Garrett Serviss 「Pleasures of the telescope」
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