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The animal resides within two small valves, not unlike those of a bivalve shell, and moults its integuments annually, which the conchiferous mollusks do not.

The absence of any deposits of importance containing recent shells in Chili, or anywhere on the western coast of South America, naturally led Mr. Darwin to the conclusion that "where the bed of the sea is either stationary or rising, circumstances are far less favorable than where the level is sinking to the accumulation of conchiferous strata of sufficient thickness and extension to resist the average vast amount of denudation."

Associated words: conchology, conchologist, malacology, testaceous, cockled, mollusk, conchiferous, conchiform conchometer, conchometry, crustacean, exuvial, exuviate, exuviation, Loricata, bivalve, multivalve, univalve. shell, n. framework; bomb, torpedo, shrapnel, grenade. shell, v. hull, shuck, shale, enucleate; bombard, besiege. shellfish, n. pl.

Farther on, trachyte and banks of conchiferous sand predominate.

The absence of any deposits of importance containing recent shells in Chili, or anywhere on the western coast of South America, naturally led Mr. Darwin to the conclusion that "where the bed of the sea is either stationary or rising, circumstances are far less favourable than where the level is sinking to the accumulation of conchiferous strata of sufficient thickness and extension to resist the average vast amount of denudation."