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HIPPURITIDAE. (Gr. _hippos_, horse; _oura_, tail). An extinct family
of Bivalve Molluscs.
HOLOPTYCHIUS (Gr. _holos_, whole; _ptuce_, wrinkle). An extinct
genus of Ganoid Fishes.
HOLOSTOMATA (Gr. _holos_, whole; _stoma_, mouth). A division
of _Gasteropodous Molluscs_, in which the aperture of the shell
is rounded, or "entire."
HOLOTHUROIDEA (Gr. _holothourion_, and _eidos_, form). An order
of _Echinodermata_ comprising the Trepangs.
HOMOCERCAL (Gr. _homos_, same; _kerkol_, tail). Applied to the
tail of Fishes when it is symmetrical, or composed of two equal
lobes.
HYBODUNTS (Gr. _hubos_, curved; _odous_, tooth). A group of Fishes
of which _Hybodus_ is the type-genus.
HYDROIDA (Gr. _hudra_; and _eidos_, form). The sub-class of the
_Hydrozoa_, which comprises the animals most nearly allied to
the Hydra.
HYDROZOA (Gr. _hudra_; and _zooen_, animal). The class of the
_Coelenterata_ which comprises animals constructed after the type
of the Hydra.
HYMENOPTERA (Gr. _humen_, a membrane; _pteron_, a wing). An order
of Insects (comprising Bees, Ants, &c.) characterised by the
possession of four membranous wings.
ICHTHYODORULITE (Gr. _ichthus_, fish; _dorus_, spear; _lithos_,
stone). The fossil fin-spine of Fishes.
ICHTHYOPTERYGIA (Gr. _ichthus_; _pterux_, wing). An extinct order
of Reptiles.
ICHTHYORNIS (Gr.
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