The cavities of the hollow tentacles open into a circular canal which surrounds the oesophagus at the base of the lophophore.
Crusoe's shipwreck and adventures, his finding the footprint in the sand, his man "Friday," - the whole atmosphere of romance which surrounds the position of the civilized man fending for himself on a desert island - these have made Defoe's great work an imperishable part of English literature.
The chief interest of the place lies in its extensive necropolis, which surrounds the city on all sides.
This variety surrounds the tropical parts of the continental shelves of South America, South Africa and eastern China.
Pure crystalline calcium carbide yields 5.8 cubic feet of acetylene per pound at ordinary temperatures, but the carbide as sold commercially, being a mixture of the pure crystalline material with the crust which in the electric furnace surrounds the ingot, yields at the best 5 cubic feet of gas per pound under proper conditions of generation.