480 GLOSSARY. 



pMbia, but sometimes restricted to the Amphibians as a dass, or to the 



single order of the Anoura. 

 Belemnitid.b (Gr. hclemnon, a dart). An extinct group of Dibranchiate 



Cephalopods, comprising the Belemnites and their allies. 

 Bifid. Cleft into two parts ; forked. 

 Bilateral. Having two sj'mmetrical sides. 



BiMANA (Lat. his, twice ; manus, a hand). The order o{ Mammalia compris- 

 ing Man alone. 

 Bipedal (Lat. his, twice ; ^es, foot). Walking upon two legs. 

 Bivalve (Lat. his, twice ; valvm, folding-doors). Composed of two plates or 



valves ; applied to the shell of the Lamellibranchiata and BracMopoda, and 



to the carapace of certain Crustacea. 

 Blastoidea (Gr. hlastos, a bud; and ciclos, form). An extinct order of Echi- 



nodermata, often called Pentrcmites. 

 Brachiopoda (Gr. brachion, an arm ; 2}ous, the foot), A class of the Mollus- 



coida, often called " Lamp- shells," characterised by possessing two fleshy 



arms continued from the sides of the mouth. 

 Brachium (Gr. hrachion, arm). Applied to the upper arm of Vertebrates. 

 Brachyura (Gr, hrachus, short; oura, tail). A tribe of the Decapod Crusta- 

 ceans with short tails {i.e., the Crabs). 

 BRADYPODiDiE (Gr. hrudus, slow ; podes, feet). The family of Edentata com- 



jn-ising the Sloths. 

 Branchia (Gr. hragchia, the gill of a tish). A respiratory organ adapted to 



breathe air dissolved in water. 

 Branchiate. Possessing gills or branehipe. 

 Braxchifera (Gr. hragchia, gill ; and ^;Ac/-o, I carry). A division of Gastcro- 



podous Molluscs, in which the respiration is atpiatic, and the respiratory 



organs are mostly in the form of distinct gills. 

 Braxchio-gasteropoda (=Brancliifera). 

 Branchiopoda (Gr. hragchia; and ^joms, foot). A legion of Crustacea, in 



which the gills are supported by the feet. 

 Branchiostegal (Gr. hragchia, gill ; stego, I cover). Applied to a membrane 



and rays by which the gills are protected in many fishes. 

 Bronteus (Gr. hronte, thunder — an epithet of Jupiter the Tliunderer). A 



genus of Trilobites. 

 Brontotherium (Gr. hronte, thunder; therlon, beast). An extinct genus of 



Ungulate Quadrupeds. 

 Brontozoum (Gr. hronte, thunder ; zoijii, animal). A genus founded on the 



largest footprints of the Triassic Sandstones of Connecticut. 

 Brdta (Lat. hrutiis, heavy, stupid). Often used to designate the Manmialian 



order of the Edentata. 

 Bryozoa (Gr. bruon, moss; zoon, animal). A synonym oi Po! gr.ua, a class of 



the Molluscoida. 

 Buccal (Lat. hucca, mouth or cheeks). Connected with the mouth. 

 BuRSiFORM (Lat. bur.'^a, a purse; forma, shape). Shaped like a purse; 



sub-spherical. 

 Byssiferous. Producing a byssus. 

 Byssus (Gr. bussos, flax). A term applied to the silky filaments by which 



the Pinna, the common Mussel, and certain other bivalve Mollnsca, attach 



themselves to foreign objects. 



