uminants, in which the horn consists of a central
bony "horn-core" surrounded by a horny sheath.

CENTRUM (Gr. _kentron_, the point round which a circle is described
by a pair of compasses). The central portion or "body" of a vertebra.

CEPHALASPIDAE. (Gr. _kephale_, head; _aspis_, shield). A family
of fossil fishes.

CEPHALIC (Gr. _kephale_, head). Belonging to the head.

CEPHALOPODA (Gr. _kephale_; and _podes_, feet). A class of the
_Mollusca_, comprising the Cuttle-fishes and their allies, in
which there is a series of arms ranged round the head.

CERATIOCARIS (Gr. _keras_, a horn; _karis_, a shrimp). A genus
of Phyllopod Crustaceans.

CERATITES (Gr. _keras_, a horn). A genus of _Ammonitidoe_.

CERATODUS (Gr. _keras_, a horn; _odous_, tooth). A genus of Dipnoous
fishes.

CERVICAL (Lat. _cervix_, the neck). Connected with or belonging
to the region of the neck.

CERVIDAE (Lat. _cervus_, a stag). The family of the Deer.

CESTRAPHORI (Gr. _kestra_, a weapon; _phero_, I carry). The group
of the "Cestraciont Fishes," represented at the present day by
the Port-Jackson Shark; so called from their defensive spines.

CETACEA (Gr. _ketos_, a whale). The order of Mammals comprising
the Whales and the Dolphins.

CETIOSAURUS (Gr. _ketos_, whale; _saura_, lizard). A genus of
Deinosaurian Reptiles.

CHEIROPTERA (Gr. _cheir_, hand; _pteron_, wing). The Mammalian
order of the Bats.

CHEIROTHERIUM (Gr. _cheir_, hand; _therion_, beast). The generic
name applied originally to the hand-shaped footprints of
Labyrinthodonts.

CHEIRURUS (Gr. _cheir_, hand; _oura_, tail). A genus of Trilobites.

CHELONIA (Gr. _chelone_, a tortoise). The Reptilian order of the
Tortoises and Turtles.

CHONETES (Gr. _chone_ or _choane_, a chamber or box). A genus
of Brachiopods.

CIDARIS (Lat. a diadem). A genus of Sea-urchins.

CLADODUS (Gr. _klados_, branch; _odous_, tooth). A genus of Fishes.

CLATHROPORA (Lat. _clathti_, a trellis; _porus_, a pore). A genus
of Lace-corals (_Polyzoa_).

CLISIOPHYLLUM (Gr. _klision_, a hut; _phullon_, leaf). A genus
of Rugose Corals.

CLYMENIA (_Clumene_, a proper name). A genus of Tetrabranchiate
Cephalopods.

COCCOSTEUS (Gr. _kokkos_, berry; _osteon_, bone). A genus of Ganoid
Fishes.

COCHLIODUS (Gr. _kochlion_, a snail-shell; _odous_, tooth). A
genus of Cestraciont Fishes.

COELENTERATA (Gr. _koilos_, hollow; _enteron_, the bowel). The
sub-kingdom which comprises the _Hydrozoa_ and _Acti