Composed of
two plates or valves; applied to the shell of the _Lamellibranchiata_
and _Brachiopoda_, and to the carapace of certain _Crustacea_.
BLASTOIDEA (Gr. _blastos_, a bud; and _eidos_, form). An extinct
order of _Echinodermata_, often called _Pentremites_.
BRACHIOPODA (Gr. _brachion_, an arm; _pous_, the foot). A class
or the _Molluscoida_, often called "Lamp-shells," characterised
by possessing two fleshy arms continued from the sides of the
mouth.
BRACHYURA (Gr. _brachus_, short; _oura_, tail). A tribe of the
Decapod _Crustaceans_ with short tails (_i.e._, the Crabs).
BRADYPODIDAE. (Gr. _bradus_, slow; _podes_, feet). The family of
_Edentata_ comprising the Sloths.
BRANCHIA (Gr. _bragchia_, the gill of a fish). A respiratory organ
adapted to breathe air dissolved in water.
BRANCHIATE. Possessing gills or branchiae.
BRONTEUS (Gr. _brone_, thunder--an epithet of Jupiter the Thunderer).
A genus of Trilobites.
BRONTOTHERIUM (Gr. _bronte_, thunder; _therion_ beast). An extinct
genus of Ungulate Quadrupeds.
BRONTOZOUM (Gr. _bronte_, thunder; _zooen_, animal). A genus founded
on the largest footprints of the Triassic Sandstones of Connecticut.
BUCCINUM (Lat. _buccinun_, a trumpet). The genus of Univalves
comprising the Whelks.
CAINOZOIC (_See_ Kainozoic.)
CALAMITES (Lat. _calamus_, a reed).
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