arcadæ

pl. [AR.CA.] A family of Conchiferous (bivalved) Molluscs. They have the shell regular and equivalve, its hinge with a long row of slender, comb-like teeth. It contains the genera Arca, Cucullæa, Pectunculus, Avicula, Leda, . Of those enumerated, all but the Cucullæa have representatives in the British fauna. ar-ca'de, S. [In Sw. arkad ; Ger. arkade ; Fr. arcade ; Sp. & Port. arcada; Low Lat. arcata ; from Cla . Lat. arcus a bow, an arch.] [ARCH.] Architecture: 1. Properly : A series of arches sustained by columns or piers. They may be open or may be closed by masonry behind thus the small arches built into the walls of some cathedrals are genuine examples of the arcade proper. An arcade differs from a colonnade in this respect, that while the columns of the former support arches, those of the latter sustain straight architraves. (Glo . of Arch .) ARCADE. "He had probably, after the fashion of his craft, plied for customers under the arcades of the Royal Exchange."-Macaulay: Hist. Eng., chap. xxi. a goodly spot, With lawns, and beds of f of flowers, and shades Of trellis-work in long arcades ." Words worth: White Doe of Rylstone, iv. 2. Le accurately: The arches and piers dividing the body of a building from its aisles. (Glo . of Arch .) 3. A long arched gallery lined on both sides with shops. (P. Cycl .) 4. Loosely: Any gallery or pa age with shops, though not arched.