_ichthus_, fish; _ornis_, bird). An extinct genus
of Birds.
ICHTHYOSAURIA (Gr. _ichthus_; _saura_, lizard). Synonymous with
_Ichthyopterygia_.
IGUANODON (_Iguana_, a living lizard; Gr. _odous_, tooth). A genus
of Deinosaurian Reptiles.
INCISOR (Lat. _incido_, I cut). The cutting teeth fixed in the
intermaxillary bones of the _Mammalia_, and the corresponding
teeth in the lower jaw.
INEQUILATERAL. Having the two sides unequal, as in the case of
the shells of the ordinary bivalves (_Lamellibranchiata_). When
applied to the shells of the _Foraminifera_, it implies that
the convolutions of the shell do not lie in the same plane, but
are obliquely wound round an axis.
INEQUIVALVE. Composed of two unequal pieces or valves.
INOCERAMUS (Gr. _is_, a fibre; _keramos_, an earthen vessel).
An extinct genus of Bivalve Molluscs.
INSECTA (Lat. _inseco_, I cut into). The class of articulate animals
commonly known as Insects.
INSECTIVORA (Lat. _insectum_, an insect; _voro_, I devour). An
order of Mammals.
INSECTIVOROUS. Living upon Insects.
INSESSORES (Lat. _insedeo_, I sit upon). The order of the Perching
Birds, often called _Passeres_.
INTERAMBULACRA. The rows of plates in an _Echinoid_ which are
not perforated for the emission of the "tube-feet."
INTERMMAXILLAE or PRAEMAXILLAE. The two bones which are situated
between the two superior maxillae in _Vertebrata_.
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