Bivalves

those mollusks whose coverings consist of two concave shelly plates or valves united by a hinge. A\ SiN — 4 2 SHELL OF A BIVALVE. A. The line acro marks the thickne . B, a, anterior extremity; b, posterior; f, alleal impres: sions; g, lower edge of the feet valve, Bivouac, an encampment of sol. diers in the open air without tents, each remaining dre ed and with his weapons at hand. ' Bizerta, a fortified seaport of Tunis, the most northern town of Af. rica; at the extremity of a bay formed; by Capes Ras-el-Zebib and El-Arid. The town is built on the shore of a lake which communicates with the sea by a canal; and in the time of Bar. baro a it was a city of great strength and magnificence. The lake is the chief source ‘of trade, as it abounds in many valuable kinds of fish.