GLOSSARY. 291 



ASIPHONATE. Not possessing a respiratory tube or siphon. (Applied to a 

 division of the Lamellibranchiate Molluscs.) 



ASTEROID (G-r. aster, a star ; and eidos, form). Star-shaped ; or possessing 

 radiating lobes or rays like a star-fish. 



ASTEBOIDA. An order of Echinodermata, comprising the Star-fishes, cha- 

 racterised by their rayed form. 



ASTOMATOUS (Gr. a, without ; stoma, mouth). Not possessing a mouth. 



AURELIA (Lat. aurum, gold). Applied to the chrysalides of some Lepi- 

 doptera, on account of their exhibiting a golden lustre. 



AVICTJLARIUM (Lat. avicula, diminutive of avis, a bird). A singular ap- 

 pendage, often shaped like the head of a bird, found in many of the 

 Polyzoa. 



AZYGOS (Gr. a, without ; zugos, yoke). Single, without a fellow. 



BACTERIUM (Gr. bakterion, a staff). A kind of staff-shaped filament which 

 appears in organic infusions after they have been exposed to the air. 



BALANID^E (Gr. batanos, an acorn). A family of sessile Cirripides, com- 

 monly called ' Acorn-shells.' 



BIFID. Cleft into two parts, forked. 



BILATERAL. Having two symmetrical sides. 



BIRAMOUS (Lat. bis, twice; ramus, a branch). Applied to a limb, which is 

 divided into two oar-like extremities (e.g. the limbs of Cirripides). 



BIVALVE (Lat. bis, twice ; valves, folding-doors). 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 of the Mollus- 

 coida, oft en called ' Lamp Shells,' characterised by possessing two fleshy 

 arms continued from the sides of the mouth. 



BRACHYURA (G-r. brachus, short ; oura, tail). A tribe of the Decapod Crus- 

 tacea, with short tails (i.e. the Crabs). 



BRACTS. (See Hydrophyllia.) 



BRANCHIA (G-r. brogchia, the gill of a fish). A respiratory organ adapted 

 to breathe air dissolved in water. 



BRANCHIATE. Possessing gills or branchiae. 



BRANCHIFERA (Gr. bragchia, gill; andphero, I carry). A division of Gas- 

 tcropodous Molluscs, in which the respiration is aquatic, and the respi- 

 ratory organs are mostly in the form of distinct gills. 



BRANCHIO-GASTEROPODA ( = Branchifera). 



BRANCHIOPODA (Gr. bragchia, and pous, foot). A legion of Crustacea, in 

 which the gills are supported by the feet. 



BRYOZOA (Gr. bruon, moss ; zoon, animal). A synonym of Polyzoa, a class of 

 the Molluscoida. 



BUCCAL (Lat. bucca, mouth or cheeks). Connected with the mouth. 



BURSIFORM (Lat. bursa, a purse; forma, shape). Shaped like a purse, sub- 

 spherical. 



BYSSIFEROUS. Producing a byssus. 



BYSSUS. A term applied to the silky filaments by which the Pinna, the 

 common Mussel, and certain other bivalve Mollusca attach themselves to 

 foreign objects. 



CJECAL (Lat. ccecus, blind). Terminating blindly, or in a closed extremity. 

 C-ZECUM (Lat. ccecus). A tube which terminates blindly, 

 C^SPITOSE (Lat. c&spes, a turf). Tufted. 



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