Molluscs, crustaceans, corals, and the like, secrete from the ocean the carbonate of lime of which their hard shells and skeletons are composed, and these hard parts go to the formation of limestone.
"Geology"
James Geikie
He tried just at first to continue and complete his sentence: "And these organs," he went on, aimlessly, "these bull's-eyes that I spoke about, are so arranged-so arranged-I was speaking on the subject of crustaceans, I think-crustaceans so arranged-" then he broke down utterly and turned sharply round to me.
"Hilda Wade A Woman With Tenacity Of Purpose"
Grant Allen
The whales subsist entirely upon these small crustaceans.
"An Antarctic Mystery"
Jules Verne