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They have been divided into three distinct groups by Forbes, each characterised by the same genera of pulmoniferous mollusca and cyprides, these genera being represented in each group by different species; they have yielded insects of many orders, and the fruits of several plants; and lastly, they contain "dirt-beds," or old terrestrial surfaces and vegetable soils at different levels, in some of which erect trunks and stumps of cycads and conifers, with their roots still attached to them, are preserved.
Nevertheless with the pulmoniferous gasteropods, or land-snails, the pairing is preceded by courtship; for these animals, though hermaphrodites, are compelled by their structure to pair together.
Gammarus, use of the chelae of. Gammarus marinus. Gannets, white only when mature. Ganoid fishes. Gaour, horns of the. Gap between man and the apes. Gaper, sexes and young of. Gardner, on an example of rationality in a Gelasimus. Garrulus glandarius. Gartner, on sterility of hybrid plants. Gasteropoda, pulmoniferous, courtship of. Gasterosteus, nidification of. Gasterosteus leiurus.
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