IN eucalypts the stamens and style of the flower are covered until anthesis by a cap or operculum. Studies of the structure of the operculum have yielded valuable information about relationships ...
(1) The hyoid gill-slit. It is commonly accepted that in all living fishes there is no sign of a ventral part of the hyoid (facial) gill slit, that the latter has vanished entirely, and that all that ...
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