To establish the exact relationship it is necessary not only to breed but to rear the medusa, which cannot always be done in 1 In some cases hydroids have been reared in aquaria from ova of medusae, but these hydroids have not yet been found in the sea (Browne [Io a]). [Please select]
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"'I've found,' said he, 'that the greenness of these seas is in truth caused by uncountable numbers of medusae----'" "Ha." [Please select]
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According to the belief now generally accepted by our best naturalists, all the members of the same order or class, for instance, the Medusae or the Macrourous crustaceans, are descended from a common progenitor. [Please select]
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