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THE ROCK-BUILDERS OF THE OCEAN.

Remarkable beauty of coral-Form and colour in the ocean-For-
merly supposed to be marine plants-Discovered to be the work of
minute animals-Placed by Linnæus at the head of the zoophytes-
Coral workers described-The polyp an extraordinary creature-Mode

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Pearls rare and beautiful objects of creation-Perilous employment
of the pearl-divers-Condemned criminals formerly employed-Ceylon
renowned for large pearls-Characteristics of the pearl-divers-Dread
of sharks-Shark-charmers-Confidence of the divers in their powers-
Pearl fishing in the Gulf of Manaar-Off the Bahrem Islands-Method
pursued by the Cingalese divers-Treatment of the pearl-oysters—
Pearl fishery in ancient times-Extent of the pearl fishery in Ceylon-
System pursued at the Pearl Islands-Oriental pearls-Their beautiful
colours and richness-Preparation of them for the market-Operation
of drilling a delicate one-How pearls are formed in the oyster-
Amusing account given by Pliny-Story of the king of the pearl-oysters
-Suppositions respecting pearls- Curious methods of the Chinese to
procure pearls-The pearl-oyster not the only mollusc which produces
pearls-Transparent oyster-shells used in China and elsewhere as a
substitute for glass-Pearls found on the British coasts-Motive of

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Ancient use of the sponge, for helmets, &c.-One of the most valu-
able spoils taken from the ocean-Long undecided whether sponges
belong to the animal or vegetable kingdom-Ranked as "zoophytes,"
or animal-plants-Aristotle's definition of the sponge--Discoveries of
Mr. Ellis-Result of Dr. Grant's experiments on the sponge-Manner

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in which, and where, sponges are obtained-Finest qualities come from
the Ottoman Archipelago-Sponge fishery at the island of Calymnos—
Depth at which sponges are found-Mode of proceeding by the sponge-
diver-The sponge in its natural state-Different from what we are
accustomed to see-Microscopic examination of the exterior skin of
the sponge-Framework of the sponge-Growth and increase of the
sponge
164-168

CHAPTER XVII.

SHELLS.

Wonderful shaping out and moulding of shells-Structure of shells
adapted to the requirements of their inhabitants-Apparatus of bivalves,
or two-shelled animals-The hinge-power over the valves-The ad-
ductor muscle-Conchology-Derivation of the term-Shells formerly
regarded as toys-Looked upon afterwards as treasures-A science of
the greatest importance-Especially to geologists-Shells of Southern
Europe-Tarento rich in shells-Greater portion of the shell animals
carnivorous-Shells of tropical America-Western coasts of Africa-
Harp-shell-The cockle-The cowry-A substitute for coin in the
East-Beautiful and rare shells found on the Australian coasts-Deep-
sea shells-Eagerly sought after by collectors-Grains of chalk micro-
scopic shells-Lowest parts of the earth consist of shell remains-Sea-
banks and coasts covered with broken shells-Abundance of the shell
Carinthium telescopium in Calcutta-Employed in road-making-
Shells possess a more or less distinct organic structure-Testacea-
Univalves - Bivalves-Multivalves-Helix or snail genus-Paletta or
limpet-Turbo-Clam or bear's-paw-Curious shells: the murex or
purple shell-Highly valued by the ancients for its dye-Volute or
mitre-shell-Strombus-Use and value of shells-Formation of shells
-Sea-shells perform an important part in the economy of Nature—
Sea-shells and sea-insects conservators of the ocean-Use of shells
multifarious-Mother-of-pearl shells used in the decoration of churches
and houses-Shell-trumpets or horns-Trumpet-shell-Employment
of shells for sacred uses in Ceylon—Shell-fish as an article of food-
Scallops-Worn in former times by pilgrims-Giant clams-Porcelain-
shells-Poached-eggs and weaver's-shuttle shells-Fusus or spindle-
shells-Roaring buckie-Wordsworth's lines on the voices of shells—
Wentletrap-shells-Trough-shells-Haliotes used for adorning papier-

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