(Gr. a, without; zugon, yoke). Single, without a fellow.
(Gr. bakterion, a staff). A microscopic organism occurring in fluids containing organic matter, and having a staff-shaped form.
(Gr. balanos, an acorn). A family of sessile Cirripedes, commonly called "Acorn shells."
(Lat. baloena, a whale). The horny plates which occupy the palate of the "whalebone" Whales.
(Gr. batos, a bramble). The family of the Elasmobranchii comprising the Rays.
(Gr. belemnon, a dart). An extinct group of Dibranchiate Cepha-lopods, comprising the Belemnites and their allies.
(Lat. bis, twice; cavus, hollow). Consisting of or possessing two cavities.
Cleft into two parts ; forked.
Having two symmetrical sides.
(Lat. bis, twice ; pes, foot). Walking upon two legs.
(Lat, bis, twice; ramus, a branch). Applied to a limb which is divided into two branches (e.g., the limbs of Cirripedes).
(Gr. blastos, a bud ; and eidos, form). An extinct order of Echinodermata, often called Pentremites.
(Gr. brachion, an arm; pous, the foot). A class of the Mol-luscoida, often called " Lamp-shells," characterised by possessing two fleshy arms continued from the sides of the mouth.
(Gr. brachion, arm). Applied to the upper arm of Vertebrates.
(Gr. brachus, short; oura, tail). A tribe of the Decapod Crustaceans with short tails (i.e., the Crabs).
(Gr. bradus, slow ; podes, feet). The family of Edentata, comprising the Sloths.
(Gr. bragchia, the gill of a fish). A respiratory organ adapted to breathe air dissolved in water.
Possessing gills or branchiae.
(Gr. bragchia, gill; and phero, I carry}. A division of Gasteropodous Molluscs, in which the respiration is aquatic, and the respiratory organs are mostly in the form of distinct gills.