This must daily pass from them as the finest sediment; much also must be produced by the infinitely numerous vermiform and Molluscous animals, which make cavities in almost every block of coral.
"Coral-Reefs"
Darwin, Charles
109. It is often desirable to ascertain the form of the internal cavities, inhabited by Molluscous animals, such as those of spiral shells, and of the various corals.
"On the Economy of Machinery and Manufactures"
Charles Babbage
Among other characters of the Molluscous animals, which render them extremely valuable in settling chronological questions in geology, may be mentioned, first, the wide geographical range of many species; and, secondly, what is probably a consequence of the former, the great duration of species in this class, for they appear to have surpassed in longevity the greater number of the mammalia and fish.
"The Student's Elements of Geology"
Sir Charles Lyell